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	Phyllosilicate minerals, 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 subgroupPages displaying short descriptions of redirect targets