Tridimit ( Greek trídymos - triple, so named because of twinning of crystals and the formation of tees [3] ), asmanite [1] - a rare [1] mineral from the class of silicas with the chemical formula SiO 2 , found in meteorites [1] and in erupted cracks rocks in Hungary and Mexico [4] , was also discovered on Mars by the Curiosity rover of the Martian scientific laboratory [5] .
| Tridimit | |
|---|---|
 | |
| Formula | SiO 2 |
| Physical properties | |
| Color | transparent or white [1] |
| Trait color | |
| Shine | glass [1] |
| Hardness | 7 [1] |
| Syngonia | |
| Refractive index | n α = 1.468–1.482 n β = 1.470–1.484 n γ = 1.474–1.486 |
Education
Tridimite is formed at high temperature in igneous or metamorphic rocks.
| Title | Symmetry | Crystallographic group | T (° C) |
|---|---|---|---|
| HP (β) | hexagonal | P6 3 / mmc | 460 |
| Lhp | hexagonal | P6 3 22 | 400 |
| OC (α) | Rhombic | C222 1 | 220 |
| OS | Rhombic | 100-200 | |
| OP | Rhombic | P2 1 2 1 2 1 | 155 |
| MC | Monoclinic | Cc | 22 |
| MX | Monoclinic | C1 | 22 |
Notes
- Wikimedia Commons has media related to the topic of Tridimit
- ↑ 1 2 3 4 5 6 Tridimit // Brockhaus and Efron Encyclopedic Dictionary : in 86 volumes (82 volumes and 4 additional). - SPb. , 1890-1907.
- ↑ mineralienatlas
- ↑ Mineralogical Encyclopedia / Ed. C. Frey: Per. with English .. - L .: Nedra , 1985. - S. 463. - 512 p. - 60,000 copies.
- ↑ Tridimit // Small Encyclopedic Dictionary of Brockhaus and Efron : in 4 volumes - St. Petersburg. 1907-1909.
- ↑ Curiosity discovered a typically terrestrial mineral Mars) on Mars . Gismeteo (06/16/2016). Date of treatment June 17, 2016.
- ↑ Rock-Forming Minerals: Framework Silicates: Slica Minerals, Feldspathoids and the Zeolites . - Geological Society, 2004. - P. 22–. - ISBN 978-1-86239-144-4 .