Pyrrhotite

A g;orious thick (2cm) 4cm crystal dominates this solid chunck of Pyrrhotite which formed on Galena. There is a bit of rubbery substance on the bottom that is difficult to remove, likely some form of museum putty. The growth features are just wonderful. Old material. Ex Mike Wortham

Locality: Nicholaevskiy Mine, Dalnegorsk, Primorski Kray Russia

Composition: iron sulfide