Siderite and Feldspar

Small spherical aggregations of sphalerites presenting so many faces as to sparkle from myriad light reflections. Chalky white feldspars add color relief. This appears to have formed as a knob, as the bottom is uniformly and cleanly separated. Wonderful aesthetic relief. Ex Jim and Paula Wilson.

Locality: Fundao, Espirito Santo, Brazil

Composition: zinc sulfide