arseniosiderite

noun
ar·se·ni·o·sid·er·ite | \ -ˈsidəˌrīt \
plural -s

Definition of arseniosiderite 

: a mineral Ca3Fe4(AsO4)4(OH)4·4H2O consisting of a basic iron calcium arsenate occurring as yellowish brown concretions

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History and Etymology for arseniosiderite

French arsénio-sidérite, from arsénio- + sidérite siderite, from German siderit

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occurring twice a year or every two years

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