steenstrupine

noun
steen·​strup·​ine | \ ˈstēnstrəˌpēn, -nˌstru̇pə̇n\
plural -s

Definition of steenstrupine

: a mineral (La,Ca,Na)(Al,Fe,Mn)(Si,P)(O,OH,F)4(?) consisting of a complex silicate, phosphate, and fluoride of the rare-earth metals, calcium, sodium, aluminum, iron, and manganese, and occurring in dark brown rhombohedral crystals

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History and Etymology for steenstrupine

Danish steenstrupine, from K. J. V. Steenstrup †1913 Danish geologist + Danish -ine

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