Anorthite
Anorthite
| Anorthite | |
|---|---|
 Anorthite from Japan | |
| General | |
| Category | Feldspar mineral |
| Chemical formula | CaAl2Si2O8 |
| Identification | |
| Color | White, grayish, reddish |
| Crystal habit | Anhedral to subhedral granular |
| Crystal system | Triclinic |
| Twinning | Common |
| Cleavage | Perfect [001] good [010] poor [110] |
| Fracture | Uneven to concoidal |
| Tenacity | Brittle |
| Mohs scale hardness | 6 |
| Luster | Vitreous |
| Diaphaneity | Transparent to translucent |
| Specific gravity | 2.72 - 2.75 |
| Optical properties | Biaxial (-), 2V 78° to 83° |
| Refractive index | nα = 1.573 - 1.577 nβ = 1.580 - 1.585 nγ = 1.585 - 1.590 |
| Birefringence | δ = 0.012 - 0.013 |
| References | [1][2][3] |
|
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Itokasi
àtúnṣe- ↑ http://www.handbookofmineralogy.org/pdfs/anorthite.pdf Handbook of Mineralogy
- ↑ http://www.mindat.org/min-246.html Mindat
- ↑ http://webmineral.com/data/Anorthite.shtml Webmineral