Lesson plan
Alloclasite
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. The mineral is monoclinic in the P2 1 space group.
Article summary
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. The mineral is monoclinic in the P2 1 space group.
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Discussion questions
- Summarise the article in your own words. Which single claim would you verify first, and why?
- Which claim in this article is most likely to be revised as the sources update? How would you check its current status?
- If two sources disagreed about one of these facts, what would you need in order to trust one over the other?
Bibliography
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Key claims and bibliography are generated from the same tracked claims and sources as the article page.