Pentlandite with pen for scale. From the mineral collection of Brigham Young University Department of Geology, Provo, Utah, courtesy of the U.S. Geological Survey Denver Library Photographic Collection. (Photo by Andrew Silver.)

Formula: (Fe,Ni)9S8 Isometric


Pentlandite is a bronzy metallic mineral found intergrown with other sulfides such as pyrrhotite and pyrite.

ASHLAND COUNTY: Pentlandite is found intergrown with chalcopyrite, pyrrhotite, cubanite and other minerals in copper-nickel massive sulfide body in the Mineral Lake area (N. 1/2 sec. 30 and E 1/2 sec. 21 T.45N. R.4W.) (Bakheit, 1981).