arseniosiderite
noun
ar·se·ni·o·sid·er·ite
-ˈsidəˌrīt
plural -s
: a mineral Ca3Fe4(AsO4)4(OH)4·4H2O consisting of a basic iron calcium arsenate occurring as yellowish brown concretions
Word History
Etymology
French arsénio-sidérite, from arsénio- + sidérite siderite, from German siderit