dark brown massive mineral fluorophosphate of iron and manganese
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AnswerCrossword Clue
triplitedark-brown, massive mineral, fluorophosphate of iron and manganese
triplitesdark-brown, massive mineral, fluorophosphate of iron and manganese
wolframiteA black or brown mineral that is the chief ore of tungsten. It consists of a tungstate of iron and manganese
gadoliniteA rare dark brown or black mineral, consisting of a silicate of iron, beryllium, and rare earths
hornblendesA 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