hortonolite
noun
hor·ton·o·lite
hȯ(r)ˈtänᵊlˌīt,
ˈhȯ(r)tᵊn-
plural -s
: a mineral (Fe,Mg,Mn)2SiO4 of the olivine series consisting of a dark silicate of iron, magnesium, and manganese
Word History
Etymology
Silas R. Horton, 19th century American mineralogist + English -o- + -lite