| Pecoraite | |
| Category: | Silicate mineral |
| Imasymbol: | Pco[1] |
| Strunz: | 9.ED.15 |
| System: | Monoclinic Unknown space group |
| Color: | Green, blue-green yellow-green |
| Mohs: | 2.5–3 |
| Luster: | Waxy, earthy |
| Streak: | Pale green |
| Gravity: | 3.084 |
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 . 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.