Pecoraite
Phyllosilicate mineral in the serpentine subgroup
From Wikipedia, the free encyclopedia
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.[2] Pecoraite is typically a green, lime green, or bluegreen mineral with a waxy, or earthy luster and a mohs hardness of 2.5.[3] Common textural habits associated with pecoraite are curved plates, spirals and tubes. It can also be granular and massive.
CategoryPhyllosilicate minerals
GroupKaolinite-Serpentine group, serpentine subgroup
FormulaNi3(Si2O5)(OH)4
| Pecoraite | |
|---|---|
Pecoraite from Eden, Vermont | |
| General | |
| Category | Phyllosilicate minerals |
| Group | Kaolinite-Serpentine group, serpentine subgroup |
| Formula | Ni3(Si2O5)(OH)4 |
| IMA symbol | Pco[1] |
| 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 |
See also
- Nepouite – Phyllosilicate mineral in the serpentine subgroup
