Pecoraite
Pecoraite is a nickel silicate mineral and a member of the serpentine group. It was named after geologist William Thomas Pecora. It is monoclinic and has a chemical composition of Ni3(Si2O5)(OH)4. It is associated with the weathering-and-or oxidation of meteorites or nickel sulfide minerals such as millerite. It is also found in altered ultramafic rocks.[1] Pecoriate is typically a green, lime green, or bluegreen mineral with a waxy, or earthy luster and a mohs hardness of 2.5.[2] Common textural habits associated with Pecoraite are curved plates, spirals and tubes. It can also be granular and massive.
| Pecoraite | |
|---|---|
 Pecoraite from Eden, Vermont | |
| General | |
| Category | Silicate mineral |
| Formula (repeating unit) | Ni3(Si2O5)(OH)4 |
| Strunz classification | 9.ED.15 |
| Crystal system | Monoclinic Unknown space group |
| Identification | |
| Color | Green, blue-green yellow-green |
| Mohs scale hardness | 2.5-3 |
| Luster | Waxy, earthy |
| Streak | Pale green |
| Specific gravity | 3.084 |
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