Pentlandite Value, Price, and Jewelry Information

By John Sobolewski (JSS) (http://www.mindat.org/photo-192760.html) [CC-BY-3.0], via Wikimedia Commons

Pentlandite

Pentlandite resembles other yellowish metallic minerals and is cut by collectors as a curiosity. The cut stones are quite attractive but too soft for hard wear.

Pentlandite Information

Data Value
Name Pentlandite
Stone Sizes Cabochons of any desired size can be out from massive material.
Formula (Fe,Ni)9S8
Colors Light bronze yellow.
Fracture Conchoidal
Hardness 3.5-4
Cleavage None
Crystallography Isometric. Crystals extremely rare; massive, granular.
Birefringence None.
Luminescence None. Nonmagnetic.
Luminescence Present No
Pleochroism None.
Luster Metallic.
Specific Gravity 4.6-5
Transparency Opaque.

Occurrence: Associated with pyrrhotite and other nickel ores in basic rocks.

Norway; Transvaal, South Africa; Alaska; California; Nevada.

Sudbury, Ontario, Canada: major ore mineral, huge masses.

Comments: Pentlandite resembles other yellowish metallic minerals and is cut by collectors as a curiosity. The cut stones are quite attractive but too soft for hard wear.

Pentlandite is usually intimately intermixed with pyrrhotite and chalcopyrite in Canadian ore bodies, creating an interesting, multicolored metallic appearance.

Name: After J.B. Pentland who first noted the mineral.