Adamite
Ojuela Mine
Mapami, Mexico
This specimen measures 15 x 6 cm
Adamite Zn2(As)4(OH)
Basic arsenate of zinc; some copper may be present
Color and Luster: Light yellow, honey yellow, brownish yellow, pale green, yellowish green, rarely colorless; vitreous
Hardness:3.5
Cleavage: Good in one direction, poor in a second
Fracture: Uneven
Crystals: Orthorhombic; usually prismatic or horizontally elongatd; often as drusy crusts of aggregates
Photo by Mary Sutherland
Descriptions taken from
The Audubon Society Field Guide to North American Rocks and Minerals