Uraninite

Uraninite

General
Category	Mineral
Chemical formula	uranium oxide, UO₂
Identification
Color	Black or brownish
Crystal habit	Massive, botryoidal, granular. A mineral is a naturally occurring substance formed through geological processes that has a characteristic chemical composition a highly ordered atomic structure and specific A chemical formula is a way of expressing information about the Atoms that constitute a particular Chemical compound, and how the relationship between those atoms changes Uranium oxide is an Oxide of the element Uranium. The metal uranium forms several oxides Uranium dioxide or uranium(IV oxide (UO2 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 botryoidal texture or Mineral habit is one in which the mineral has a globular external form resembling a bunch of grapes as derived from the Greek Crystals uncommon.
Crystal system	Isometric
Cleavage	Indistinct
Fracture	Conchoidal to uneven
Mohs Scale hardness	5 - 6
Luster	Submetallic, greasy
Refractive index	Opaque
Pleochroism	None
Streak	Same as colour, black or brownish
Specific gravity	7. A crystal system is a category of Space groups which characterize Symmetry of structures in three dimensions with Translational symmetry in three directions The cubic crystal system (or isometric) is a Crystal system where the Unit cell is in the shape of a Cube. Cleavage, in Mineralogy, is the tendency of crystalline materials to split along definite planes creating smooth surfaces of which there are several named types In the field of Mineralogy, fracture is a term used to describe the shape and texture of the surface formed when a Mineral is broken The Mohs scale of mineral hardness characterizes the scratch resistance of various Minerals through the ability of a harder material to scratch a softer material Lustre (or luster) is a description of the way light interacts with the surface of a Crystal, rock, or Mineral. The refractive index (or index of Refraction) of a medium is a measure for how much the speed of light (or other waves such as sound waves is reduced inside the medium Pleochroism is an Optical phenomenon in which grains of a rock appear to be different colors when observed at different angles under a Petrographic microscope. The streak (also called powder color) of a Mineral is the Color of the powder produced when it is dragged across an unweathered surface Specific gravity is defined as the ratio of the Density of a given solid or liquid substance to the density of water at a specific temperature and pressure typically 5 - 10
Solubility	Soluble in sulfuric, nitric, and hydrofluoric acids. Solubility is the characteristic Physical property referring to the ability of a given substance the Solute, to dissolve in a Solvent. Sulfuric (or sulphuric acid, H 2 S[[oxygen O]]4 is a strong Mineral acid. Nitric acid ( H[[nitrate NO3]] also known as Aqua fortis and spirit of nitre, is a highly corrosive and Hydrofluoric acid is a Solution of Hydrogen fluoride in Water.
Major varieties
Pitchblende	Massive

Uraninite is a uranium-rich mineral with a composition that is largely UO₂ (uranium dioxide), but which also contains UO₃ and oxides of lead, thorium, and rare earths. Uranium (jʊˈreɪniəm is a silvery-gray Metallic Chemical element in the A mineral is a naturally occurring substance formed through geological processes that has a characteristic chemical composition a highly ordered atomic structure and specific Uranium dioxide (2 an Oxide of Uranium, also known as urania or uranic oxide is a black radioactive crystalline powder Uranium trioxide (UO3, also called Uranyl oxide, uranium(VI oxide, and uranic oxide, is the hexavalent Oxide of An oxide is a Chemical compound containing at least one Oxygen atom as well as at least one other element Characteristics Lead has a dull luster and is a dense, Ductile, very soft highly Thorium (ˈθɔːriəm is a Chemical element with the symbol Th and Atomic number 90 Rare earth elements and rare earth metals are according to IUPAC, the collection of seventeen Chemical elements in the Periodic table, namely It is most commonly known in the variety pitchblende (from pitch, because of its black color, and blende, a term used by German miners to denote minerals whose density suggested metal content, but whose exploitation was, at the time they were named, either impossible or not economically feasible). The German people (Deutsche are an Ethnic group, in the sense of sharing a common German culture, descent and speaking the German language as All uraninite minerals contain a small amount of radium as a radioactive decay product of uranium; it was in pitchblende from the Jáchymov (then Joachimsthal, Austria-Hungary) now in the Czech Republic that Marie Curie discovered radium. Radium (ˈreɪdiəm is a radioactive Chemical element which has the symbol Ra and Atomic number 88 Radioactive decay is the process in which an unstable Atomic nucleus loses energy by emitting ionizing particles and Radiation. For other places called Joachimsthal see Joachimsthal (disambiguation Jáchymov (ˈjaxɪmof in German originally Thal, later Sankt Joachimsthal The Czech Republic ( ˈt͡ʃɛskaː ˈrɛpuˌblɪka short form in Česko ˈt͡ʃɛskɔ also called Czechia, Uraninite also always contains small amounts of the lead isotopes, Pb-206 and Pb-207, the end products of the decay series of the uranium isotopes U-238 and U-235 respectively. Characteristics Lead has a dull luster and is a dense, Ductile, very soft highly Isotopes (Greek isos = "equal" tópos = "site place" are any of the different types of atoms ( Nuclides Small amounts of helium are also present in uraninite as a result of alpha decay. Helium ( He) is a colorless odorless tasteless non-toxic Inert Monatomic Chemical Alpha decay is a type of radioactive decay in which an Atomic nucleus emits an Alpha particle (two protons and two neutrons bound together into a particle Helium was first found on Earth in uraninite after previously being discovered spectroscopically in the Sun's atmosphere. Spectroscopy was originally the study of the interaction between Radiation and Matter as a function of Wavelength (λ The Sun (Sol is the Star at the center of the Solar System. The extremely rare element technetium can be found in uraninite in very small quantities (about 0. Technetium (tɛkˈniːʃɪəm is the lightest Chemical element with no Stable isotope. 2 ng/kg), produced by the spontaneous fission of uranium-238. Nuclear fission is the splitting of the nucleus of an atom into parts (lighter nuclei) often producing Free neutrons and other smaller nuclei which may

Uraninite is a major ore of uranium. An important occurrence of pitchblende is at Great Bear Lake in the Northwest Territories of Canada, where it is found in large quantities associated with silver. Great Bear Lake ( Slavey: Sahtú, French: Grand lac de l'Ours) is the largest Lake entirely within Canada ( The Northwest Territories (ˌnɔrθˌwɛstˈtɛrɨtɔriz ( NWT or NT; French, les Territoires du Nord-Ouest) is a territory Country to "Dominion of Canada" or "Canadian Federation" or anything else please read the Talk Page Silver (ˈsɪlvɚ is a Chemical element with the symbol " Ag " (argentum from the Ancient Greek: ἀργήντος - argēntos gen Some of the highest grade uranium ores in the world have been found in the Athabasca Basin in northern Saskatchewan. The Athabasca Basin is a region of Northern Saskatchewan and Alberta Canada that is best known as the world's leading source of Uranium. Saskatchewan (səˈskætʃəwən) is a prairie province in Canada, which has an area of 588276 It also occurs in Australia, Germany, England, and South Africa. For a topic outline on this subject see List of basic Australia topics. Germany, officially the Federal Republic of Germany ( ˈbʊndəsʁepuˌbliːk ˈdɔʏtʃlant is a Country in Central Europe. England is a Country which is part of the United Kingdom. Its inhabitants account for more than 83% of the total UK population whilst its mainland The Republic of South Africa (also known by other official names) is a country located at the southern tip of the continent of Africa In the United States it can be found in the states of New Hampshire, Connecticut, North Carolina, Wyoming, Colorado and New Mexico. The United States of America —commonly referred to as the New Hampshire ( is a state in the New England region of the northeastern United States of America. Connecticut ( is a state located in the New England region of the northeastern United States of America. North Carolina ( is a state located on the Atlantic Seaboard in the southeastern United States The State of Wyoming ( is a sparsely populated state in the western region of the United States. The State of Colorado ( or chiefly by nonresidents) is a state located in the Rocky Mountain region of the United States of America. New Mexico ( is a state located in the southwestern region of the United States of America.

References

Dana's Manual of Mineralogy ISBN 0-471-03288-3

Dictionary

-noun

(mineralogy) Any of several brownish-black forms of uranium dioxide, U O₂, (especially pitchblende) that is the chief ore of uranium; it is isomorphous with thorianite.

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References

See also

Dictionary

uraninite

-noun