Wulfenite
Los Lamentos
Chihuahua, Mexico
This specimen measures 12cm x 13cm
Wulfenite PbMoO4
Inosilicates; Lead Molybdate
Color and Luster: Yellow, orange, brown, yellowish gray, whitish; resinous, adamantine; streak white
Hardness: 3
Cleavage: Distinct, one direction
Fracture: Subconcoidal, uneven
Crystals: Triclinic, pseudo-tetragonal due to twinning; commonly square tabular, sometimes extremely thin, infrequently cube-like, also massive, coarse to fine granular
Photo by Mary Sutherland
Descriptions taken from
The Audubon Society Field Guide to North American Rocks and Minerals