schallerite

noun
schal·ler·ite | \ ˈshaləˌrīt \
plural -s

Definition of schallerite 

: a mineral Mn8Si6O18(AsO3)(OH).3¹/₂ H2O(?) consisting of a hydrous basic silicate and arsenite of manganese

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History and Etymology for schallerite

Waldemar T. Schaller, born 1882 American mineralogist + English -ite

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occurring twice a year or every two years

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