alloclasite
Sign in to saveAlloclasite, or , is a sulfosalt mineral (IMA symbol: Acl). It is a member of the arsenopyrite group. Alloclasite crystallizes in the monoclinic system and typically forms as columnar to radiating acicular prismatic clusters. It is an opaque steel-gray to silver-white, with a metallic luster and a black streak. It is brittle with perfect cleavage, a Mohs hardness of 5 and a specific gravity of 5.91–5.95.
Wikidata facts
- Subclass of
- sulfide class of minerals
- Named after
- cleavage
Show 5 more facts
- chemical formula
- CoAsS
- Nickel-Strunz 9th edition (updated 2009)
- 2.EB.10b
- Nickel-Strunz '10th ed', review of (9th ed/ 2009 update)
- 2.EB.10b
- crystal system
- monoclinic crystal system
- IMA Mineral Symbol
- Acl
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Encyclopedic overview
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Alloclasite, or , is a sulfosalt mineral (IMA symbol: Acl). It is a member of the arsenopyrite group. Alloclasite crystallizes in the monoclinic system and typically forms as columnar to radiating acicular prismatic clusters. It is an opaque steel-gray to silver-white, with a metallic luster and a black streak. It is brittle with perfect cleavage, a Mohs hardness of 5 and a specific gravity of 5.91–5.95.
It was first described in 1866 for an occurrence in Romania. Its name is derived from Greek for "other" and "to break," in reference to its distinct cleavage which distinguished it from the similar appearing mineral marcasite.
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