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Stishovite (/ˈstɪʃəvaɪt/ STISH-ə-vyte) 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.
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silicon oxides quartz unlike tetragonal form dioxide crystal extremely rare silica however discovered bound structure sio2 polymorph references found hard
| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| Stishovite | Birefringence | δ = 0.027 | 1.00 | infobox |
| Stishovite | Category | Tectosilicate minerals | 1.00 | infobox |
| Stishovite | Color | Colorless (when pure) | 1.00 | infobox |
| Stishovite | Crystal class | Ditetragonal dipyramidal (4/mmm) H–M symbol: (4/m 2/m 2>/m) | 1.00 | infobox |
| Stishovite | Crystal system | Tetragonal | 1.00 | infobox |
| Stishovite | Diaphaneity | Transparent to translucent | 1.00 | infobox |
| Stishovite | Formula | SiO2 | 1.00 | infobox |
| Stishovite | Group | Quartz group | 1.00 | infobox |
| Stishovite | IMA symbol | Sti | 1.00 | infobox |
| Stishovite | Luster | Vitreous | 1.00 | infobox |
| Stishovite | Melting point | (decomposes) | 1.00 | infobox |
| Stishovite | Mohs scale hardness | 9.5 | 1.00 | infobox |
| Stishovite | Optical properties | Uniaxial (+) | 1.00 | infobox |
| Stishovite | Refractive index | nω = 1.799–1.800 nε = 1.826–1.845 | 1.00 | infobox |
| Stishovite | Space group | P42/mnm (No. 136) | 1.00 | infobox |
| Stishovite | Specific gravity | 4.35 (synthetic) 4.29 (calculated) | 1.00 | infobox |
| Stishovite | Strunz classification | 4.DA.40 (Oxides) | 1.00 | infobox |
| Stishovite | Unit cell | a = 4.1772(7) Å, c = 2.6651(4) Å; Z = 2 | 1.00 | infobox |
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