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Mineralpedia Details for Clinoclase

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Clinoclase

Clinoclase

Named after the Greek words for “incline,” klino, and “fraction,” klasma, in reference to the inclined cleavage planes. Clinclase is an uncommon mineral that occurs in small amounts in oxidized arsenic-rich hydrothermal base metal deposits. Localities for Clinoclase include in England, France, Germany, Italy, Slovakia, the United States, Argentina, Chile, South Africa, Japan, and Australia, among several other minor localities. Associated minerals include olivenite, cornwallite, cornubite, and conichalcite.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/clinoclase.pdf

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. 
Class
2/m - Prismatic 
Fracture
Uneven 
Hardness
2.5 - 3 
WebMineral
View Clinoclase 
Mindat
View Clinoclase 

Clinoclase from Majuba Hill mine, Pershing Co., Nevada, United States

Clinoclase
            from Majuba Hill mine, Pershing Co., Nevada, United States

Light to dark blue prismatic crystals to 3mm.

Elongated, dark blue bladed crystals to 1mm.

Platy blue Clinoclase crystals in radial patterns to 3mm across.

Clinoclase crystals as translucent blue bladed singles to 0.5mm and composite dark blue, curved, sheaf-like bundles to 1mm on Cornubite and/or Cornwallite.

Deep blue, lustrous, tabular, well-defined crystals of Clinoclase to 2mm overgrown on brighter green botryoidal Cornwallite.

Deep blue, lustrous, thick tabular crystals of Clinoclase to 1mm with good coverage over a bed of botyroidal dark green Cornwallite and/or Cornubite.


Clinoclase from Murdock Mine, Plumas Co., California, United States

Clinoclase
            from Murdock Mine, Plumas Co., California, United States

Deep glassy blue tiny prismatic crystals to 1mm.

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