igneous rock(n = noun.substance) - rock formed by the solidification of molten magma;
is a kind of rock, stone
has particulars: andesite, aplite, groundmass, adesite, batholite, batholith, pluton, plutonic rock, diorite, gabbro, pegmatite, peridotite, rhyolite, volcanic rock, porphyritic rock, porphyry

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