Metallic crystal aggregates of the extremely rare Pt-Sb mineral stumpflite from the TL in Driekop mine in Southafrica, and one of the few localities known worldwide. Ex Vandenbroucke Museum collection from Waregem, Belgium. — Photo: David Hospital · CC BY-SA 4.0
Stumpflite
A rare platinum-bismuth sulfide crystallizing in the orthorhombic system.
Intro adapted from Wikipedia (CC BY-SA).
Stumpflite is an IMA-recognized mineral species in the sulfide class, with the chemical formula PtSb.
It crystallizes in the hexagonal crystal system (space group P6_3mc). It is a member of the Nickeline structural group.
Key properties: specific gravity 13.52; Metallic luster.
IMA symbol Stm, IMA status: approved, named in 1972.
Found in platinum concentrates from an ultramafic pipe deposit (Driekop mine, South Africa).
It is found associated with Geversite, Pt–Fe alloys (Driekop mine, South Africa).
The mineral was named to honor Professor Eugen Friedrich Stumpfl (1931–), University of Hamburg, Hamburg, Germany, who first described the mineral.