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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