Formula: Cu₃(SO₄)(OH)₄

Species: Sulfates

Colour: Emerald-green to blackish-green, also light green.

Lustre: Vitreous

Hardness: 3½

Specific Gravity: 3.88

Crystal System: Orthorhombic

Name: Named in 1889 by William F. Hillebrand after the type locality at the Antler Mine, Mohave Co., Arizona, USA.

Type Locality: Antler Mine (Spuyten Duyvel Mine), Pine Peak, Hualapai Mining District, Hualapai Mountains, Mohave County, Arizona, USA. A secondary mineral occurring in the oxidized zone of copper deposits in arid regions. Less common than the related and sometimes visually similar brochantite with which it may be confused.