hortonolite

noun
hor·​ton·​o·​lite | \hȯ(r)ˈtänᵊlˌīt, ˈhȯ(r)tᵊn-\
plural -s

Definition of hortonolite 

: a mineral (Fe,Mg,Mn)2SiO4 of the olivine series consisting of a dark silicate of iron, magnesium, and manganese

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History and Etymology for hortonolite

Silas R. Horton, 19th century American mineralogist + English -o- + -lite

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