Sphalerite, pyrrhotite and galena. Unknown Provenance
Pyrrhotite (brown, bottom) is intergrown with sphalerite (light grey, left) and galena (white, centre). A central silicate crystal has curved cleavage planes along which galena, pyrrhotite and sphalerite have penetrated. Dark grey areas are silicates.
Polished block, plane polarized light, x 80, air