coesite

Coesite () is a form (polymorph) of silicon dioxide (SiO2) that is formed when very high pressure (2–3 gigapascals), and moderately high temperature (), are applied to quartz. Coesite was first synthesized by Loring Coes, Jr., a chemist at the Norton Company, in 1953.

Key facts

Mineral.name: Coesite
Mineral.image: Coesiteimage.jpg
Mineral.imagesize: 260px
Mineral.caption: Crossed-polars image of coesite grain (gray) ~1 mm across in eclogite. Small, colored inclusion is pyroxene. Polycrystalline rim is quartz.
Mineral.category: Tectosilicate minerals
Mineral.group: Quartz group
Mineral.molweight: 60.0843 g/mol
Mineral.IMAsymbol: Coe
Mineral.strunz: 4.DA.35
Mineral.system: Monoclinic
Mineral.class: Prismatic (2/m) (same H–M symbol)
Mineral.symmetry: C2/c
Mineral.unit cell: a = 7.143b = 12.383c = 7.143 [Å]β = 120.00°Z = 16
Mineral.color: Colorless
Mineral.habit: Inclusions in UHP metamorphic minerals up to 3 mm in size
Mineral.fracture: Conchoidal
Mineral.tenacity: Brittle
Mineral.mohs: 7.5-8

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Wikidata facts

Subclass of: tectosilicates
Image: Coesiteimage.jpg

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Commons category: Coesite
Nickel-Strunz 9th edition (updated 2009): 4.DA.35
Nickel-Strunz '10th ed', review of (9th ed/ 2009 update): 4.DA.35
chemical formula: SiO₂
crystal system: monoclinic crystal system
streak color: white
IMA Mineral Symbol: Coe
Strunz 8th edition (series ID, updated): IV/D.01b

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Encyclopedic overview

5 sections

Contents

Occurrences
Crystal structure
See also
References
External links

==Occurrences==

Excerpted from Wikipedia’s “coesite” article, available under the CC BY-SA 4.0 licence.

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