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igneous rock

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{adj: igneous, pyrogenic, pyrogenous} produced under conditions involving intense heat
"igneous rock is rock formed by solidification from a molten state; especially from molten magma"
"igneous fusion is fusion by heat alone"
"pyrogenic strata"

{adj: irruptive, plutonic} of igneous rock that has solidified beneath the earth's surface; granite or diorite or gabbro

{adj: volcanic} igneous rock produced by eruption and solidified on or near the earth's surface; rhyolite or andesite or basalt
"volcanic rock includes the volcanic glass obsidian"

{n: basalt} the commonest type of solidified lava; a dense dark grey fine-grained igneous rock that is composed chiefly of plagioclase feldspar and pyroxene

{n: batholith, batholite, pluton, plutonic rock} large mass of intrusive igneous rock believed to have solidified deep within the earth

{n: biotite} dark brown to black mica found in igneous and metamorphic rock

{n: crystallite} any of numerous minute rudimentary crystalline bodies of unknown composition found in glassy igneous rock

{n: granite} plutonic igneous rock having visibly crystalline texture; generally composed of feldspar and mica and quartz

{n: igneous rock} rock formed by the solidification of molten magma

{n: nephelinite} an igneous rock consisting of nepheline and pyroxene

{n: pegmatite} a form of igneous rock consisting of extremely coarse granite resulting from the crystallization of magma rich in rare elements

{n: peridotite} a dark coarse-grained igneous rock consisting principally of olivine

{n: porphyry, porphyritic rock} any igneous rock with crystals embedded in a finer groundmass of minerals

{n: sill} (geology) a flat (usually horizontal) mass of igneous rock between two layers of older sedimentary rock

{n: volcanic rock} extrusive igneous rock solidified near or on the surface of the Earth

{n: xenolith} (geology) a piece of rock of different origin from the igneous rock in which it is embedded

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