alloclasite

== English == === Etymology === allo- (“different”) + Ancient Greek κλάω (kláō, “break”) + -ite, due to its cleavage pattern distinct from that of marcasite. === Noun === alloclasite (uncountable) (mineralogy) A brittle monoclinic sulfosalt mineral of the arsenopyrite group. === Further reading === David Barthelmy (1997–2026), “Alloclasite”, in Webmineral Mineralogy Database. “alloclasite”, in Mindat.org, Keswick, Va.: Hudson Institute of Mineralogy, 2000–2026.