Answer | Crossword Clue |
---|---|
lepidomelanes | LEPIDOMELANE, a black mica rich in iron, occurring in scales |
lepidomelane | a black mica rich in iron, occurring in scales |
staurolite | mineral, basic iron aluminum silicate, Fe2Al2O7(SiO4)4(OH), occurring in brown to black prismatic crystals, which are often twinned in the form of a cross |