Augite
General
Category	Silicate mineral
Chemical formula	(Ca,Mg,Fe)SiO3
Identification
Color	Pale brown to purplish or greenish brown, also dark grey sometimes
Crystal system	Monoclinic
Cleavage	{110} good
Fracture	uneven
Mohs Scale hardness	5 to 6. The silicate minerals make up the largest and most important class of rock-forming Minerals They are classified based on the structure of their silicate Ion group 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 A crystal system is a category of Space groups which characterize Symmetry of structures in three dimensions with Translational symmetry in three directions In Crystallography, the monoclinic Crystal system is one of the 7 lattice Point groups A crystal system is described by three vectors. 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 5
Luster	Vitreous
Refractive index	α = 1. 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 671 - 1. 735, β = 1. 672 - 1. 741, γ = 1. 703 - 1. 774
Streak	Greenish-white
Specific gravity	3. 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 19 - 3. 56

Augite is a single chain inosilicate mineral described chemically as (Ca,Mg,Fe)SiO₃ or calcium magnesium iron silicate. The silicate minerals make up the largest and most important class of rock-forming Minerals They are classified based on the structure of their silicate Ion group A mineral is a naturally occurring substance formed through geological processes that has a characteristic chemical composition a highly ordered atomic structure and specific Calcium (ˈkælsiəm is the Chemical element with the symbol Ca and Atomic number 20 Magnesium (mægˈniːziəm is a Chemical element with the symbol Mg, Atomic number 12 Atomic weight 24 Iron (ˈаɪɚn is a Chemical element with the symbol Fe (ferrum and Atomic number 26 For the Artificial intelligence Androids of the 1990s Science fiction series Space Above and Beyond, see Silicate (AI The crystals are monoclinic and prismatic. In Materials science, a crystal is a Solid in which the constituent Atoms Molecules or Ions are packed in a regularly ordered repeating Augite has two prominent prismatic cleavages, meeting at angles near 90°.

Augite is a solid solution in the pyroxene group. A solid solution is a Solid - state Solution of one or more solutes in a Solvent. The pyroxenes are a group of important rock-forming Silicate minerals found in many Igneous and metamorphic rocks. Diopside and hedenbergite are important endmembers in augite, but augite can also contain significant aluminium, titanium, and sodium and other elements. Diopside is a Monoclinic Pyroxene Mineral with composition MgCaSi2O6 Hedenbergite, Ca[[iron Fe]] Si 2 0 6 is the Iron rich end member of the Pyroxene group having a Monoclinic WikipediaNaming Titanium (taɪˈteɪniəm is a Chemical element with the symbol Ti and Atomic number 22 Sodium (ˈsoʊdiəm is an element which has the symbol Na( Latin natrium, from Arabic natrun) atomic number 11 atomic mass 22 The calcium content of augite is limited by a miscibility gap between it and pigeonite and orthopyroxene: when occurring with either of these other pyroxenes, the calcium content of augite is a function of temperature and pressure, but mostly of temperature, and so can be useful in reconstructing temperature histories of rocks. Pigeonite is a mineral in the Clinopyroxene group It has a general formula of ( Ca, Mg, Fe)(MgFe Si 2 O 6 The pyroxenes are a group of important rock-forming Silicate minerals found in many Igneous and metamorphic rocks. With declining temperature, augite may exsolve lamellae of pigeonite and/or orthopyroxene. There is also a miscibility gap between augite and omphacite, but this gap occurs at lower temperature and is not well understood. Omphacite is a member of the Pyroxene group of Silicate minerals with formula ( Ca, Na)( Mg, Fe 2+ Al

It is found in igneous rocks; for example, gabbro and basalt. Igneous rocks (etymology from Latin ignis, fire are rocks formed by solidification of cooled Magma (molten rock Gabbro (ˈɡæbrəʊ is a dark coarse-grained intrusive Igneous rock chemically equivalent to Basalt. Basalt (bəˈsɔːlt ˈbeisɔːlt ˈbæsɔːlt is a common Extrusive Volcanic rock. It also occurs in relatively high-temperature metamorphic rocks such as mafic granulite. Metamorphic rock is the result of the transformation of an existing rock type the protolith, in a process called Metamorphism, which means "change Mafic is an adjective describing a Silicate mineral or rock that is rich in magnesium and iron the term was derived by contracting "magnesium" and "ferric" Granulites are fine to medium–grained Metamorphic rocks that have experienced high Temperatures of metamorphism composed mainly of Feldspars sometimes associated

Occasional specimens have a shiny appearance that give rise to the mineral's name, which is from the Greek augites, meaning "brightness", although ordinary specimens have a dull (dark green, brown or black) finish.

References

• Deer, W. A. , Howie, R. A. , and Zussman, J. (1992). An introduction to the rock-forming minerals (2nd ed. ). Harlow: Longman ISBN 0-582-30094-0

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