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schefferite

noun
schef·​fer·​ite | \ˈshefəˌrīt\
plural -s

Definition of schefferite 

: a mineral (Ca,Mn)(Mg,Fe,Mn)Si2O6 that is a brown to black variety of pyroxene containing manganese and frequently much iron

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History and Etymology for schefferite

Swedish schefferit, from H. T. Scheffer †1759 Swedish chemist + Swedish -it -ite

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