of or pertaining to rocks rich in dark ferromagnesian minerals
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AnswerCrossword Clue
maficof or pertaining to rocks rich in dark, ferromagnesian minerals
maficof, relating to, or being a group of usually dark-colored minerals rich in magnesium and iron
magnesian(chiefly of rocks and minerals) Containing or relatively rich in magnesium
SIALICPertaining to rocks rich in silica