Tourmaline
Tourmaline is a mineral with the chemical formula NaLi(Al,Fe,Mn,Mg)3Al6(BO3)3Si6O18(OH)4. It has a Mohs hardness of 7 - 7.5 and vitreous to resinous luster.
Tourmaline properties
| Type | Mineral |
|---|---|
| Chemical formula | NaLi(Al,Fe,Mn,Mg)3Al6(BO3)3Si6O18(OH)4 |
| Mohs hardness | 7 - 7.5 |
| Luster | Vitreous to resinous |
| Typical colors | Various, including pink, green, blue, black, and multicolored |
| Formation | Typically forms in igneous and metamorphic environments, often found in complex pegmatites |
| Rarity | 6 / 10 |
Mohs hardness 7–7.5 — hard
1 · Talc5 · Apatite10 · Diamond
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