Dark lustrous blue-green, curved Clinoclase crystals to 2mm in clusters with minor fine pale green Strashimirite covering one side of porphyritic matrix. Excellent piece with good coverage of Clinoclase!
Clinoclase
Formula
Cu3AsO4(OH)3
Crystal System
Monoclinic
Crystal Habit
Crystals rare, typically needlelike, tabular, as rosettes and radial fibrous spherical aggregates, as crusts and coatings.
Cleavage
perfect
Luster
Vitreous, pearly on cleavages
Color
Dark greenish blue to greenish black; in transmitted light, blue-green.
Streak
Bluish green
Geological Setting
A rare secondary mineral in the oxidized zone of some arsenic-rich hydrothermal base-metal deposits.
