Answer | Crossword Clue |
---|---|
triplite | dark-brown, massive mineral, fluorophosphate of iron and manganese |
triplites | dark-brown, massive mineral, fluorophosphate of iron and manganese |
wolframite | A black or brown mineral that is the chief ore of tungsten. It consists of a tungstate of iron and manganese |
gadolinite | A rare dark brown or black mineral, consisting of a silicate of iron, beryllium, and rare earths |
hornblendes | A dark brown, black, or green mineral of the amphibole group consisting of a hydroxyl alumino-silicate of calcium, magnesium, and iron, occurring in many igneous and metamorphic rocks |