Pecoraite

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

Pecoraite is a nickel silicate mineral and a member of the serpentine group. 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 as shears in ultramafic rocks. Pecoriate is typically a green, lime green, or bluegreen mineral with a waxy, or earthy luster and a mohs hardness of 2.5. Common textural habits associated with Pecoraite are curved plates, spirals and tubes. It can also be granular and massive.