schefferite

\\ˈshefəˌrīt\ noun (-s)

Etymology: Swedish schefferit, from H. T. Scheffer died 1759 Swedish chemist + Swedish -it -ite

: 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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schefferite Min.

(ˈʃɛfəraɪt)

[Named 1862 after H. T. Scheffer, a Swedish chemist: see -ite.]

A manganese pyroxene, of yellowish or reddish-brown colour.

in Dana Syst. Min. (ed. 5) 215.