Dark rocks
Crossword Clue

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AnswerCrossword Clue
CHERTSDark rocks
BASALTSDark volcanic rocks.
maficof or pertaining to rocks rich in dark, ferromagnesian minerals
melaphyreany one of several dark-colored augitic, eruptive rocks allied to basalt
melaphyresMELAPHYRE, any one of several dark-colored augitic, eruptive rocks allied to basalt
augitesa usually black or dark green mineral that consists of aluminous pyroxene and is found especially in igneous rocks
augitea usually black or dark green mineral that consists of aluminous pyroxene and is found especially in igneous rocks
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
cordieriteA dark blue mineral occurring chiefly in metamorphic rocks. It consists of an aluminosilicate of magnesium, and also occurs as a dichroic gem variety
biotitesvery common mineral of the mica group, occurring in black, dark-brown, or dark-green sheets and flakes: an important constituent of igneous and metamorphic rocks
biotitevery common mineral of the mica group, occurring in black, dark-brown, or dark-green sheets and flakes: an important constituent of igneous and 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