pentlandiitit

Pentlandiite is a sulfide mineral with the chemical formula (Fe, Ni)9S8. It is the primary ore mineral of nickel and is also a source of cobalt, platinum, and palladium. Pentlandiite is typically found in mafic and ultramafic intrusive igneous rocks, such as gabbro and peridotite. It often occurs as exsolution lamellae or intergrowths with other sulfide minerals, particularly pyrrhotite and chalcopyrite.

The mineral was first described in 1865 and named after the Scottish geologist and mineralogist Joseph Barclay Pentland, who discovered it in the nickel mines of Sudbury, Ontario, Canada. Pentlandiite has a brass-yellow color and a metallic luster. It is relatively soft, with a Mohs hardness of 3.5 to 4, and has a specific gravity of about 4.6 to 5.0. It is opaque and typically forms massive or granular aggregates.

The formation of pentlandiite is often associated with magmatic processes where sulfide melts separate from silicate melts. These sulfide melts can then crystallize to form pentlandiite. The presence of pentlandiite in significant economic concentrations is crucial for the global supply of nickel, a metal widely used in stainless steel production, batteries, and various alloys. The mining and processing of pentlandiite-bearing ores are therefore of considerable economic importance worldwide.