strongly dichroic blue mineral consisting of a silicate of magnesium aluminum and iron common in metamorphic rocks
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iolitestrongly dichroic blue mineral consisting of a silicate of magnesium, aluminum, and iron: common in metamorphic rocks
iolitesstrongly dichroic blue mineral consisting of a silicate of magnesium, aluminum, and iron: common in metamorphic rocks
cordieritesstrongly dichroic blue mineral consisting of a silicate of magnesium, aluminum, and iron: common in metamorphic rocks
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
cordieriteA dark blue mineral occurring chiefly in metamorphic rocks. It consists of an aluminosilicate of magnesium, and also occurs as a dichroic gem variety
augitesilicate mineral, chiefly of calcium, magnesium, iron, and aluminum: a dark-green to black variety of monoclinic pyroxene, characteristic of basic rocks
augiticsilicate mineral, chiefly of calcium, magnesium, iron, and aluminum: a dark-green to black variety of monoclinic pyroxene, characteristic of basic rocks
augitessilicate mineral, chiefly of calcium, magnesium, iron, and aluminum: a dark-green to black variety of monoclinic pyroxene, characteristic of basic rocks