Quartz crystal. Quartz (from German) is the most abundant Mineral in the Earth 's Continental crust (although Feldspar is more common in The individual grains of this polycrystalline mineral sample are clearly visible.

Synthetic bismuth hopper crystal

Insulin crystals

Gallium, a metal that easily forms large single crystals

A large monocrystal of potassium dihydrogen phosphate grown from solution by Saint-Gobain for the megajoule laser of CEA. Bismuth (ˈbɪzməθ is a Chemical element that has the symbol Bi and Atomic number 83 A hopper crystal is a form of Crystal, defined by its " Hoppered quot shape Insulin is a Hormone with intensive effects on both metabolism and several other body systems (eg vascular compliance Gallium (ˈgæliəm is a Chemical element that has the symbol Ga and Atomic number 31 Monopotassium phosphate (also potassium dihydrogen phosphate, KDP, or monobasic potassium phosphate, MKP) -- 24 -- Saint-Gobain SA ( is a French Multinational corporation, founded in 1665 in Paris and headquartered on the outskirts of Paris at La Laser Mégajoule ( LMJ) is an experimental Inertial confinement fusion (ICF device being built in France by the French nuclear science directorate The Commissariat à l’énergie atomique (Atomic Energy Commission or CEA, is a French “public establishment of an industrial and commercial character” whose

In chemistry, mineralogy, and materials science, a crystal is a solid in which the constituent atoms, molecules, or ions are packed in a regularly ordered, repeating pattern extending in all three spatial dimensions. Chemistry (from Egyptian kēme (chem meaning "earth") is the Science concerned with the composition structure and properties Mineralogy is an Earth Science focused around the Chemistry, Crystal structure, and physical (including optical) properties of Minerals Materials Science or Materials Engineering is an interdisciplinary field involving the properties of matter and its applications to various areas of Science and A solid' object is in the States of matter characterized by resistance to Deformation and changes of Volume. History See also Atomic theory, Atomism The concept that matter is composed of discrete units and cannot be divided into arbitrarily tiny In Chemistry, a molecule is defined as a sufficiently stable electrically neutral group of at least two Atoms in a definite arrangement held together by An ion is an Atom or Molecule which has lost or gained one or more Valence electrons giving it a positive or negative electrical charge

The word crystal is a loan from the ancient Greek word κρύσταλλος (krustallos), which had the same meaning, but according to the ancient understanding of crystal. The Ancient Greek language is the historical stage in the development of the Hellenic language family spanning the Archaic (c At root it means anything congealed by freezing, such as ice. Ice is a Solid phase, usually crystalline, of a Non-metalic substance that is liquid or gas at Room temperature, such as Ammonia ^[1] The word once referred particularly to quartz, or "rock crystal". Quartz (from German) is the most abundant Mineral in the Earth 's Continental crust (although Feldspar is more common in

Most metals encountered in everyday life are polycrystals. Polycrystalline materials are solids that are composed of many Crystallites of varying size and orientation Crystals are often symmetrically intergrown to form crystal twins. Crystal twinning occurs when two separate crystals share some of the same Crystal lattice points in a symmetrical manner

Crystal structure

The process of forming a crystaline struture from a fluid or from materials dissolved in the fluid is often referred to as crystalization. Crystallization is the (natural or artificial process of formation of solid Crystals precipitating from a homogeneous --> identical Solution In the ancient example referenced by the root meaning of the word crystal, water being cooled undergoes a phase change from liquid to solid beginning with small ice crystals that grow until they fuse, forming a polycrystalline struture. The physical properties of the ice depend on the size and arrangement of the individual crystals, or grains, and the same may be said of metals solidifying from a molten state.

Which crystal structure the fluid will form depends on the chemistry of the fluid, the conditions under which it is being solidified, and also on the ambient pressure. In Mineralogy and Crystallography, a crystal structure is a unique arrangement of Atoms in a Crystal. FLUID ( F ast L ight '''U'''ser '''I'''nterface D esigner is a graphical editor that is used to produce FLTK Source code Chemistry (from Egyptian kēme (chem meaning "earth") is the Science concerned with the composition structure and properties Room temperature (also referred to as ambient temperature) is a common term to denote a certain Temperature within enclosed space at which humans are accustomed While the cooling process usually results in the generation of a crystalline material, under certain conditions, the fluid may be frozen in a noncrystalline state. Generation (from the Greek γενεά) also known as procreation, is the act of producing Offspring. FLUID ( F ast L ight '''U'''ser '''I'''nterface D esigner is a graphical editor that is used to produce FLTK Source code In most cases, this involves cooling the fluid so rapidly that atoms cannot travel to their lattice sites before they lose mobility. History See also Atomic theory, Atomism The concept that matter is composed of discrete units and cannot be divided into arbitrarily tiny In Geometry and Crystallography, a Bravais lattice, named after Auguste Bravais, is an infinite set of points generated by a set of discrete translation A noncrystalline material, which has no long-range order, is called an amorphous, vitreous, or glassy material. In Physics, long-range order characterizes physical Systems in which remote portions of the same sample exhibit correlated behavior An amorphous solid is a Solid in which there is no Long-range order of the positions of the Atoms (Solids in which there is long-range atomic order are Vitreous refers to a material in an Amorphous, Glassy state (in contrast to a Crystalline state Glass in the common sense refers to a Hard, Brittle, transparent Solid, such as that used for Windows many It is also often referred to as an amorphous solid, although there are distinct differences between solids and glasses: most notably, the process of forming a glass does not release the latent heat of fusion. An amorphous solid is a Solid in which there is no Long-range order of the positions of the Atoms (Solids in which there is long-range atomic order are The standard Enthalpy of fusion (symbol \Delta{}H_{fus} also known as the heat of fusion or specific melting heat, is the amount of For this reason, many scientists consider glassy materials to be viscous liquids rather than solids, although this is a controversial topic. Viscosity is a measure of the resistance of a Fluid which is being deformed by either Shear stress or Extensional stress. Liquid is one of the principal States of matter. A liquid is a Fluid that has the particles loose and can freely form a distinct surface at the boundaries of A solid' object is in the States of matter characterized by resistance to Deformation and changes of Volume. A controversy or dispute is a commencement of a conflict between statements of accepted fact and a new or unaccepted proposal that disagrees with argues against

For more details on this topic, see glass. Glass in the common sense refers to a Hard, Brittle, transparent Solid, such as that used for Windows many

Crystalline structures occur in all classes of materials, with all types of chemical bonds. A chemical bond is the physical process responsible for the attractive interactions between Atoms and Molecules and which confers stability to diatomic and polyatomic Almost all metal exists in a polycrystalline state; amorphous or single-crystal metals must be produced synthetically, often with great difficulty. Although the term metallic bond is often used in contrast to the term Covalent bond it is better to speak of metallic bonding, because this type of bonding is Ionically bonded crystals can form upon solidification of salts, either from a molten fluid or when it condenses from a solution. An ionic bond (or electrovalent bond) is a type of Chemical bond that can often form between Metal and Non-metal Ions (or Salt is a Dietary mineral composed primarily of Sodium chloride that is essential for Animal life but toxic to most land plants Melting is a process that results in the phase change of a substance from a Solid to a Liquid. Covalently bonded crystals are also very common, notable examples being diamond, silica, and graphite. In Mineralogy, diamond is the allotrope of carbon where the carbon atoms are arranged in The Chemical compound silicon dioxide, also known as silica or silox (from the Latin " Silex " is an Oxide The Mineral graphite, as with Diamond and Fullerene, is one of the Allotropes of carbon. Polymer materials generally will form crystalline regions, but the lengths of the molecules usually prevent complete crystallization. A polymer is a large Molecule ( Macromolecule) composed of repeating Structural units typically connected by Covalent Chemical bonds Length is the long Dimension of any object The length of a thing is the distance between its ends its linear extent as measured from end to end In Chemistry, a molecule is defined as a sufficiently stable electrically neutral group of at least two Atoms in a definite arrangement held together by Weak Van der Waals forces can also play a role in a crystal structure; for example, this type of bonding loosely holds together the hexagonal-patterned sheets in graphite. The Van der Waals equation is an Equation of state that can be derived from a special form of the potential between a pair of molecules (hard-sphere repulsion Structure is a fundamental and sometimes Intangible notion covering the Recognition, Observation, nature, and Stability of Regular hexagon The internal Angles of a regular hexagon (one where all sides and all angles are equal are all 120 ° and the hexagon has 720 degrees The Mineral graphite, as with Diamond and Fullerene, is one of the Allotropes of carbon.

Most crystalline materials have a variety of crystallographic defects. Crystalline solids have a very regular atomic structure that is the local positions of atoms with respect to each other are repeated at the atomic scale The types and structures of these defects can have a profound effect on the properties of the materials.

Crystal phases or forms

Polymorphism is the ability of a sold to exist in more than one crystal form. Polymorphism in Materials science is the ability of a solid material to exist in more than one form or Crystal structure For example, water ice is ordinarily found in the hexagonal form Ice Ih, but can also exist as the cubic ice Ic, the rhombohedral ice II, and many other forms. Ice is a Solid phase, usually crystalline, of a Non-metalic substance that is liquid or gas at Room temperature, such as Ammonia Ice Ih is the hexagonal crystal form of ordinary Ice, or frozen water. Ice Ic is a metastable cubic Crystalline variant of Ice. The Oxygen atoms are arranged in a diamond structure In Crystallography, the rhombohedral (or trigonal) Crystal system is one of the seven lattice point groups named after the two-dimensional Ice II is a Rhombohedral crystalline form of Ice with highly ordered structure

Amorphous phases are also possible with the same molecule, such as amorphous ice. An amorphous solid is a Solid in which there is no Long-range order of the positions of the Atoms (Solids in which there is long-range atomic order are Amorphous ice is an Amorphous solid form of water meaning it consists of Water molecules that are randomly arranged like the atoms of common Glass. In this case, the phenomenon is known as polyamorphism. In Materials science polyamorphism is the ability of a substance to exist in several different Amorphous modifications

For pure chemical elements, polymorphism is known as allotropy. Allotropy (Gr allos, other and tropos, manner is a behavior exhibited by certain Chemical elements these elements can exist in two or more different For example, diamond, graphite, and fullerenes are different allotropes of carbon. In Mineralogy, diamond is the allotrope of carbon where the carbon atoms are arranged in The Mineral graphite, as with Diamond and Fullerene, is one of the Allotropes of carbon. "C60" and "C-60" redirect here For other uses see C60 (disambiguation. Carbon (kɑɹbən is a Chemical element with the symbol C and its Atomic number is 6

Other meanings and characteristics

Ice crystals

Since the initial discovery of crystal-like individual arrays of atoms that are not regularly repeated, made in 1982 by Dan Shechtman, the acceptance of the concept and the word quasicrystal have led the International Union of Crystallography to redefine the term crystal to mean "any solid having an essentially discrete diffraction diagram", thereby shifting the essential attribute of crystallinity from position space to Fourier space. Ice is a Solid phase, usually crystalline, of a Non-metalic substance that is liquid or gas at Room temperature, such as Ammonia Dan Shechtman is the Philip Tobias Professor of Materials Science at the Technion - Israel Institute of Technology, an Associate of the US Department of Energy's Quasicrystals are structural forms that are both ordered and nonperiodic The International Union of Crystallography (IUCr is a member of the International Council for Science (ICSU and exists to serve the world community of crystallographers Frequency domain is a term used to describe the analysis of Mathematical functions or signals with respect to frequency Within the family of crystals one distinguishes between traditional crystals, which are periodic, or repeating, at the atomic scale, and aperiodic crystals which are not. This broader definition adopted in 1996 reflects the current understanding that microscopic periodicity is a sufficient but not a necessary condition for crystals. ,

While the term "crystal" has a precise meaning within materials science and solid-state physics, colloquially "crystal" refers to solid objects that exhibit well-defined and often pleasing geometric shapes. Materials Science or Materials Engineering is an interdisciplinary field involving the properties of matter and its applications to various areas of Science and Solid-state physics, the largest branch of Condensed matter physics, is the study of rigid Matter, or Solids The bulk of solid-state physics theory and In this sense of the word, many types of crystals are found in nature. The shape of these crystals is dependent on the types of molecular bonds between the atoms to determine the structure, as well as on the conditions under which they formed. Snowflakes, diamonds, and common salt are common examples of crystals. "Snowfall" redirects here For other uses see Snow (disambiguation or Snowfall (disambiguation. In Mineralogy, diamond is the allotrope of carbon where the carbon atoms are arranged in Salt is a Dietary mineral composed primarily of Sodium chloride that is essential for Animal life but toxic to most land plants

Some crystalline materials may exhibit special electrical properties such as the ferroelectric effect or the piezoelectric effect. Ferroelectricity is a physical property of a material whereby it exhibits a spontaneous electric polarization, the direction of which can be switched between equivalent Piezoelectricity is the ability of some materials (notably Crystals and certain Ceramics including bone to generate an Electric potential in response to Additionally, light passing through a crystal is often refracted or bent in different directions, producing an array of colors; crystal optics is the study of these effects. Light, or visible light, is Electromagnetic radiation of a Wavelength that is visible to the Human eye (about 400–700 Refraction is the change in direction of a Wave due to a change in its Speed. In Computer science an array is a Data structure consisting of a group of elements that are accessed by indexing. Crystal optics is the branch of Optics that describes the behaviour of Light in Anisotropic media, that is media (such as Crystals In periodic dielectric structures a range of unique optical properties can be expected as seen in photonic crystals. A dielectric is a nonconducting substance ie an insulator. The term was coined by William Whewell in response to a request from Michael Faraday. Photonic crystals are periodic Optical (nanostructures that are designed to affect the motion of Photons in a similar way that periodicity of a Semiconductor

Crystallography is the scientific study of crystals and crystal formation. Crystallography is the experimental science of determining the arrangement of Atoms in Solids In older usage it is the scientific study of Crystals The

Crystalline rocks

Fossil shell with calcite crystals

Inorganic matter, if free to take that physical state in which it is most stable, always tends to crystallize. FOSSIL is a standard protocol for allowing serial communication for Telecommunications programs under the DOS Operating system. Calcite is a carbonate mineral and the most stable polymorph of Calcium carbonate ( Ca[[carbon C]] O 3 Traditionally inorganic compounds are considered to be of mineral not biological origin Matter is commonly defined as being anything that has mass and that takes up space. A state of matter (or physical state, or form of matter) has physical properties which are qualitatively different from other states of matter A stable is a Building in which Livestock, especially Horses are kept Crystalline rock masses have consolidated from aqueous solution or from molten magma. In Geology, rock is a naturally occurring aggregate of Minerals and/or Mineraloids The Earth's outer solid layer the ‘ Lithosphere In Chemistry, a solution is a Homogeneous Mixture composed of two or more substances Magma (Plurals magmas and magmata) is molten rock that sometimes forms beneath the surface of the Earth (or any other Terrestrial planet The vast majority of igneous rocks belong to this group and the degree of crystallization depends primarily on the conditions under which they solidified. Igneous rocks (etymology from Latin ignis, fire are rocks formed by solidification of cooled Magma (molten rock Such rocks as granite, which have cooled very slowly and under great pressures, have completely crystallized, but many lavas were poured out at the surface and cooled very rapidly; in this latter group a small amount of amorphous or glassy matter is frequent. Granite (ˈɡrænɪt is a common and widely occurring type of intrusive, Felsic, igneous rock. Lava is molten rock expelled by a Volcano during an eruption When first expelled from a volcanic vent it is a Liquid at Temperatures An amorphous solid is a Solid in which there is no Long-range order of the positions of the Atoms (Solids in which there is long-range atomic order are Glass in the common sense refers to a Hard, Brittle, transparent Solid, such as that used for Windows many Other crystalline rocks, the evaporites such as rock salt, gypsum and some limestones have been deposited from aqueous solution, mostly owing to evaporation in arid climates. Evaporites (iˈvæpəraɪt are water-soluble Mineral sediments that result from the Evaporation of bodies of surficial Water. Halite is the Mineral form of Sodium chloride, Na[[chlorine Cl]] commonly known as rock salt. Gypsum is a very soft Mineral composed of Calcium sulfate dihydrate with the Chemical formula Ca[[sulfur S]] O 4·2 Limestone is a Sedimentary rock composed largely of the Mineral Calcite ( Calcium carbonate: CaCO3 Evaporation is the process by which Molecules in a Liquid state (e In general terms the Climate of a local or region is said to be arid when it is characterized by a severe lack of available Water, to the extent of hindering Climate encompasses the temperatures humidity rainfall atmospheric particle count and numerous other meteorogical factors in a given region over long periods of Still another group, the metamorphic rocks which includes the marbles, mica-schists and quartzites; are recrystallized, that is to say, they were at first fragmental rocks, like limestone, shale and sandstone and have never been in a molten condition nor entirely in solution. Metamorphic rock is the result of the transformation of an existing rock type the protolith, in a process called Metamorphism, which means "change Marble is a nonfoliated Metamorphic rock resulting from the Metamorphism of Limestone, composed mostly of Calcite (a crystalline form of The schists form a group of medium-grade Metamorphic rocks chiefly notable for the preponderance of lamellar Minerals such as Micas chlorite Quartzite (from German Quarzit) not to be confused with the Mineral Quartz, is a hard Metamorphic rock which was originally Limestone is a Sedimentary rock composed largely of the Mineral Calcite ( Calcium carbonate: CaCO3 Shale (also called mudstone) is a fine-grained Sedimentary rock whose original constituents were Clay minerals or Muds It is characterized by Sandstone is a Sedimentary rock composed mainly of Sand -size Mineral or rock grains. Melting is a process that results in the phase change of a substance from a Solid to a Liquid. The high temperature and pressure conditions of metamorphism have acted on them erasing their original structures, and inducing recrystallization in the solid state. Metamorphism can be defined as the solid state recrystallisation of pre-existing rocks due to changes in heat and/or pressure and/or introduction of fluids i ^[2]

See also

• Amorphous solid

References

1. ^ “kreus-”, The American Heritage® Dictionary of the English Language: Fourth Edition: Appendix I: Indo-European Roots, 2000 . The melting point of a solid is the temperature range at which it changes state from solid to Liquid. An ionic crystal is a Crystal consisting of Ions bound together by their Electrostatic attraction An ion is an Atom or Molecule which has lost or gained one or more Valence electrons giving it a positive or negative electrical charge ---- Bold text Coulomb's law', developed in the 1780s by French physicist Charles Augustin de Coulomb, may be stated in scalar form In Science and engineering, a conductor is a material which contains movable Electric charges. A molecular crystal is a Crystal whose molecules are held together by weak physical bonding such as Van der Waals forces or Hydrogen bonding as "Polar molecule" and "Non-polar" redirect here The Van der Waals equation is an Equation of state that can be derived from a special form of the potential between a pair of molecules (hard-sphere repulsion In Physics, Chemistry, and Biology, intermolecular forces are forces that act between stable Molecules or between functional groups of Nonconductors or electrical insulators are materials which lack movable electric charges and which therefore lack a low-resistance path for charge flow Liquid is one of the principal States of matter. A liquid is a Fluid that has the particles loose and can freely form a distinct surface at the boundaries of Metallic crystal structure is that of Metal Atoms surrounded by a sea of valence Electrons Electrons are given by the metal atoms and belong to In Physics, electron mobility (or simply mobility) is a quantity relating the Drift velocity of Electrons to the applied Electric field Although the term metallic bond is often used in contrast to the term Covalent bond it is better to speak of metallic bonding, because this type of bonding is For malleability in Cryptography, see Malleability (cryptography. Ductility is a mechanical property used to describe the extent to which materials can be deformed plastically or "stretched" into "wires" without An amorphous solid is a Solid in which there is no Long-range order of the positions of the Atoms (Solids in which there is long-range atomic order are In Crystallography, atomic packing factor (APF or packing fraction is the fraction of volume in a Crystal structure that is occupied by Atoms Biomineralisation is the process by which living organisms produce minerals often to harden or stiffen existing tissues In Mineralogy, shape and size give rise to descriptive terms applied to the typical appearance or habit of Crystals The many terms used by mineralogists A crystal system is a category of Space groups which characterize Symmetry of structures in three dimensions with Translational symmetry in three directions A crystallite is a domain of solid-state matter that has the same structure as a single Crystal. ICSD is a database of Inorganic Crystal structure data It was founded in 1978 by G Lead crystal (also called crystal) is Lead glass that has been hand- or machine-cut with facets Liquid crystals are substances that exhibit a phase of matter that has properties between those of a conventional Liquid, and those of a Solid Metallic crystal structure is that of Metal Atoms surrounded by a sea of valence Electrons Electrons are given by the metal atoms and belong to Quasicrystals are structural forms that are both ordered and nonperiodic A seed crystal is a small piece of Single crystal material from which a large Crystal of the same material typically is to be grown A single crystal, also called monocrystal, is a Crystalline Solid in which the Crystal lattice of the entire sample is continuous and unbroken Glass in the common sense refers to a Hard, Brittle, transparent Solid, such as that used for Windows many
2. ^ This article incorporates text from the Encyclopædia Britannica Eleventh Edition article "Petrology", a publication now in the public domain. The Encyclopædia Britannica Eleventh Edition (1910–1911 is a 29-volume reference work that marked the beginning of the Encyclopædia Britannica The public domain is a range of abstract materials &ndash commonly referred to as Intellectual property &ndash which are not owned or controlled by anyone

External links

• Howard, J. Michael; Darcy Howard (Illustrator) (1998). Introduction to Crystallography and Mineral Crystal Systems (html). Bob's Rock Shop. Retrieved on 2008-04-20. 2008 ( MMVIII) is the current year in accordance with the Gregorian calendar, a Leap year that started on Tuesday of the Common Events 1303 - The University of Rome La Sapienza is instituted by Pope Boniface VIII.
• Various authors (2007). Teaching Pamphlets (html). Commission on Crystallographic Teaching. Retrieved on 2008-04-20. 2008 ( MMVIII) is the current year in accordance with the Gregorian calendar, a Leap year that started on Tuesday of the Common Events 1303 - The University of Rome La Sapienza is instituted by Pope Boniface VIII.
• Various authors (2004). Crystal Lattice Structures:Index by Space Group (html). U. S. Naval Research Laboratory, Center for Computational Materials Science. Retrieved on 2008-04-20. 2008 ( MMVIII) is the current year in accordance with the Gregorian calendar, a Leap year that started on Tuesday of the Common Events 1303 - The University of Rome La Sapienza is instituted by Pope Boniface VIII.
• Krassmann, Thomas (2005-2008). The Giant Crystal Project (html). Krassmann. Retrieved on 2008-04-20. 2008 ( MMVIII) is the current year in accordance with the Gregorian calendar, a Leap year that started on Tuesday of the Common Events 1303 - The University of Rome La Sapienza is instituted by Pope Boniface VIII.