Dumortierite
Dumortierite is a mineral with the chemical formula Al7Si3O12(BO3). It has a Mohs hardness of 7 and vitreous to silky luster.
Dumortierite properties
| Type | Mineral |
|---|---|
| Chemical formula | Al7Si3O12(BO3) |
| Mohs hardness | 7 |
| Luster | Vitreous to silky |
| Typical colors | Primarily blue, but can also be gray, green, or brown |
| Formation | Typically forms in metamorphic rocks and is found in aluminum-rich environments |
| Rarity | 5 / 10 |
Mohs hardness 7 — hard
1 · Talc5 · Apatite10 · Diamond
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