Tangeite

IMA formula: CaCu(VO₄)(OH)

Crystallography: Orthorhombic. P2₁2₁2₁. a = 7.45 Å, b = 9.26 Å, c = 5.91 Å. Z = 4.

Specimen #133. Tangeite (volborthite?). Monument No. 1 Mine, Monument No. 1 channel, Mystery Valley, Mineral Mining District, Navajo County, Arizona, USA. FOV 4.7 mm.