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.^[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.

Pecoraite
Pecoraite from Eden, Vermont
General
Category	Silicate mineral
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 – Nickel ore from the serpentine family (phyllosilicate)Pages displaying short descriptions of redirect targets