Answer | Crossword Clue |
---|---|
lepidomelane | a black mica rich in iron, occurring in scales |
lepidomelanes | 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 |
tenorite | mineral, cupric oxide, CuO, occurring in veins of copper in black, minute scales |
tenorites | mineral, cupric oxide, CuO, occurring in veins of copper in black, minute scales |
hematite | very common mineral, iron oxide, Fe2O3, occurring in steel-gray to black crystals and in red earthy masses: the principal ore of iron |