Prehnite
Prehnite is a mineral with the chemical formula Ca2Al(AlSi3O10)(OH)2·nH2O. It has a Mohs hardness of 6 - 6.5 and vitreous to pearly luster.
Prehnite properties
| Type | Mineral |
|---|---|
| Chemical formula | Ca2Al(AlSi3O10)(OH)2·nH2O |
| Mohs hardness | 6 - 6.5 |
| Luster | Vitreous to pearly |
| Typical colors | Green, pale yellow, gray, white |
| Formation | Typically forms in low-grade metamorphic rocks and in the cavities of basalt. |
| Rarity | 6 / 10 |
Mohs hardness 6–6.5 — fairly hard
1 · Talc5 · Apatite10 · Diamond
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