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
CategorySilicate mineral
Formula
(repeating unit)		Ni3(Si2O5)(OH)4
IMA symbolPco[1]
Strunz classification9.ED.15
Crystal systemMonoclinic
Unknown space group
Identification
ColorGreen, blue-green yellow-green
Mohs scale hardness2.5-3
LusterWaxy, earthy
StreakPale green
Specific gravity3.084

See also
  • Nepouite – Nickel ore from the serpentine family (phyllosilicate)

References
  1. Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
  2. "Mineralogy Database". Mindat. Retrieved 2013-03-21.
  3. "Webmineral". Retrieved 2013-03-21.


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