stokesite
noun
stokes·ite
ˈstōkˌsīt
plural -s
: a mineral CaSnSi3O9.2H2O consisting of a hydrous silicate of calcium and tin and occurring in colorless orthorhombic crystals (hardness 6, specific gravity 3.2)
Word History
Etymology
Sir George G. Stokes †1903 British mathematician and physicist + English -ite