imerinite
noun
im·er·i·nite
ˌiməˈrēˌnīt
plural -s
: a monoclinic amphibole Na2(Mg,Fe)6Si8O22(O,OH)2 that is related to richterite and occurs in colorless to blue acicular crystals : a basic silicate of sodium, iron, and magnesium
Word History
Etymology
French imerinite, from Imerina, province of Madagascar, its locality + French -ite