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Mafic
Mafic
is an adjective describing a
silicate mineral
or rock that is rich in
magnesium
and
iron
, and hence is a
portmanteau
of "magnesium" and "
ferric
". Most mafic minerals are dark in color, and common rock-forming mafic minerals include
olivine
,
pyroxene
,
amphibole
, and
biotite
. Common mafic rocks include
basalt
,
dolerite
and
gabbro
.
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