Mineralpedia Details for 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
- Crystal System
- Crystal Habit
- Crystals rare, typically needlelike, tabular, as rosettes and radial fibrous spherical aggregates, as crusts and coatings.
- Vitreous, pearly on cleavages
- Dark greenish blue to greenish black; in transmitted light, blue-green.
- Bluish green
- Geological Setting
- A rare secondary mineral in the oxidized zone of some arsenic-rich hydrothermal base-metal deposits.
- 2/m - Prismatic
- 2.5 - 3
- View Clinoclase
- View Clinoclase
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
Deep glassy blue tiny prismatic crystals to 1mm.