Sillimanite
Sillimanite is a mineral with the chemical formula Al2SiO5. It has a Mohs hardness of 6.5 - 7 and vitreous to pearly luster.
Sillimanite properties
| Type | Mineral |
|---|---|
| Chemical formula | Al2SiO5 |
| Mohs hardness | 6.5 - 7 |
| Luster | Vitreous to pearly |
| Typical colors | Colorless, green, brown, yellow, or gray |
| Formation | Metamorphic conditions, particularly in high-grade metamorphic rocks |
| Rarity | 6 / 10 |
Mohs hardness 6.5–7 — hard
1 · Talc5 · Apatite10 · Diamond
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