تریدیمیت
Sign in to saveTridymite is a high-temperature polymorph of silica and usually occurs as minute tabular white or colorless pseudo-hexagonal crystals, or scales, in cavities in felsic volcanic rocks. Its chemical formula is SiO2. Tridymite was first described in 1868 and the type location is in Hidalgo, Mexico. The name is from the Greek tridymos for triplet as tridymite commonly occurs as twinned crystal trillings (compound crystals comprising three twinned crystal components).
Key facts
- Mineral.name
- Tridymite
- Mineral.category
- Tectosilicate minerals
- Mineral.group
- Quartz group
- Mineral.image
- Tridymite tabulars - Ochtendung, Eifel, Germany.jpg
- Mineral.imagesize
- 260px
- Mineral.caption
- Tabular tridymite crystals from Ochtendung, Eifel, Germany
- Mineral.formula
- SiO2
- Mineral.molweight
- 60.08 g/mol
- Mineral.strunz
- 4.DA.10
- Mineral.IMAsymbol
- Trd
- Mineral.system
- Orthorhombic (α-tridymite)
- Mineral.class
- Disphenoidal (222) H–M symbol: (222)
- Mineral.symmetry
- C2221
- Mineral.color
- Colorless, white
- Mineral.habit
- Platy – sheet forms
- Mineral.cleavage
- {0001} indistinct, {1010} imperfect
- Mineral.fracture
- Brittle – conchoidal
- Mineral.mohs
- 7
via Wikipedia infobox
Wikidata facts
- Subclass of
- tectosilicates
- Has part
- silicon dioxide
- Named after
- twin
- Image
- Tridymite tabulars - Ochtendung, Eifel, Germany.jpg
Show 8 more facts
- Nickel-Strunz 9th edition (updated 2009)
- 4.DA.10
- Nickel-Strunz '10th ed', review of (9th ed/ 2009 update)
- 4.DA.10
- Commons category
- Tridymite
- chemical formula
- SiO₂
- crystal system
- orthorhombic crystal system
- streak color
- white
- IMA Mineral Symbol
- Trd
- Strunz 8th edition (series ID, updated)
- IV/D.01a
via Wikidata · CC0