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

(Fe,Ni)9S8

Pleochroism

None.

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.