Clinoclase

Clinoclase is a hydrous copper arsenate mineral, Cu3AsO4(OH)3. Clinoclase is a rare secondary copper mineral and forms acicular crystals in the fractured weathered zone above copper sulfide deposits. It occurs in vitreous, translucent dark blue to dark greenish blue colored crystals and botryoidal masses. The crystal system is monoclinic 2/m. It has a hardness of 2.5 - 3 and a relative density of 4.3. Associated minerals include malachite, olivenite, quartz, limonite, adamite, azurite, and brochantite among others.

Clinoclase
A sample of clinoclase
General
CategoryArsenate minerals
Formula
(repeating unit)		Cu3AsO4(OH)3
IMA symbolCno[1]
Strunz classification8.BE.20
Crystal systemMonoclinic
Crystal classPrismatic (2/m)
(same H-M symbol)
Space groupP21/c
Identification
References[2][3][4]

Clinoclase was discovered in 1830 in the county of Cornwall in England. Found at Broken Hill New South Wales, Australia and associated with copper ore deposits in Arizona, California, Montana, New Mexico, Nevada, and Utah in the United States. Also found in France, Germany, Czech Republic, Austria, Romania, Russia, and The Democratic Republic of The Congo.

Abichite is another name for clinoclase.

The type locality for clinoclase is the Wheal Gorland mine at St Day, Cornwall in the United Kingdom.[5]

See also

References
Wikimedia Commons has media related to Clinoclase.
Wikisource has the text of the 1911 Encyclopædia Britannica article "Clinoclasite".
  1. Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
  2. Mineralienatlas
  3. Webmineral
  4. Mineral Galleries Archived 2004-10-13 at the Wayback Machine
  5. Clinoclase: Clinoclase mineral information and data


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