hausmannite

noun
haus·mann·ite | \ ˈhau̇sməˌnīt \
plural -s

Definition of hausmannite 

: an opaque mineral Mn3O4 consisting of manganese tetroxide found commonly in brownish black tetragonal crystals

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History and Etymology for hausmannite

J. F. L. Hausmann †1859 German mineralogist + English -ite

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