A greenish rock forming mineral of the orthopyroxene class consisting of a magnesium iron silicate
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AnswerCrossword Clue
hyperstheneA greenish rock-forming mineral of the orthopyroxene class, consisting of a magnesium iron silicate
pyroxenesAny of a large class of rock-forming silicate minerals, generally containing calcium, magnesium, and iron and typically occurring as prismatic crystals
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