Chapmanite [SEP] named after
Chapmanite
Chapmanite is a rare silicate mineral belonging to the nesosilicate group, discovered in 1924, and named in honour of the late Edward John Chapman (1821–1904), a geology professor at the University of Toronto. Chemically, it is an iron antimony silicate, closely related to bismutoferrite, and may contain aluminium impurities. It is closely associated with silver mines, most notably the Keeley mine in Ontario, Canada, found in quartz veinlets containing graphite in gneiss. It takes the form of a powdery, yellow-green,
Changbaiite (Y: 1978) 04.DF.10    (IUPAC: lead diniobium hexaoxide)
37. Changchengite (IMA1995-047) 02.EB.25    (IUPAC: iridium bismuthide sulfide)
38. Changoite (IMA1997-041) 07.CC.50    (IUPAC: disodium zinc disulfate tetrahydrate)
39. Chantalite (IMA1977-001) 09.AG.55    (IUPAC: calcium dialuminium nesosilicate tetrahydroxyl)
40. Chaoite (IMA1968-019) 01.CB.05b   
41. Chapmanite (IMA1968 s.p., 1924) 09.ED.25    (IUPAC: diron(III) antimony(III