stishovite
Sign in to savethumb|Pressure-temperature diagram for various forms of silicon dioxide, including stishovite (at top left)
In the Vinony graph
Within Vinony's link graph, stishovite is referenced by 334 other articles, and connects out to rock, International Standard Book Number and mineral.
Vinony files it under Impact event minerals, Minerals in space group 136 and Silica polymorphs.
Its subject is documented across 16 Wikipedia language editions.
Key facts
- Mineral.mohs
- 9.5
- Mineral.name
- Stishovite
- Mineral.category
- Tectosilicate minerals
- Mineral.group
- Quartz group
- Mineral.image
- stishovite.png
- Mineral.caption
- Crystal structure of stishovite
- Mineral.formula
- SiO2
- Mineral.IMAsymbol
- Sti
- Mineral.strunz
- 4.DA.40 (Oxides)
- Mineral.system
- Tetragonal
- Mineral.class
- Ditetragonal dipyramidal (4/mmm) H–M symbol: (4/m 2/m 2>/m)
- Mineral.symmetry
- P42/mnm (No. 136)
- Mineral.unit cell
- a = 4.1772(7) Å, c = 2.6651(4) Å; Z = 2
- Mineral.color
- Colorless (when pure)
- Mineral.luster
- Vitreous
- Mineral.refractive
- nω = 1.799–1.800 nε = 1.826–1.845
- Mineral.opticalprop
- Uniaxial (+)
- Mineral.birefringence
- δ = 0.027
via Wikipedia infobox
Wikidata facts
- Image
- Stishovite.jpg
Show 7 more facts
- Commons category
- Stishovite
- chemical formula
- SiO₂
- Nickel-Strunz 9th edition (updated 2009)
- 4.DA.40
- Nickel-Strunz '10th ed', review of (9th ed/ 2009 update)
- 4.DA.40
- Mohs' hardness
- 9.4
- IMA Mineral Symbol
- Sti
- Strunz 8th edition (series ID, updated)
- IV/D.01b
via Wikidata · CC0
~3 min read
Encyclopedic overview
5 sectionsContents
- Appearance
- Synthesis
- See also
- References
- External links
thumb|Pressure-temperature diagram for various forms of silicon dioxide, including stishovite (at top left)
Stishovite ( ) is an extremely hard, dense tetragonal form (polymorph) of silicon dioxide. It is very rare on the Earth's surface; however, it may be a predominant form of silicon dioxide in the Earth, especially in the lower mantle.
Excerpted from Wikipedia’s “stishovite” article, available under the CC BY-SA 4.0 licence.