rock formed by the solidification of molten magma
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a dark grey volcanic rock
light-colored and fine-grained granitic rock consisting chiefly of quartz and feldspars
(geology) the matrix of fine-grained crystalline material in which larger crystals are embedded
dark greyish extrusive rock
batholite, batholith, pluton, plutonic rock
large mass of intrusive igneous rock believed to have solidified deep within the earth
a granular crystalline intrusive rock
one of a family of granular intrusive rocks
a form of igneous rock consisting of extremely coarse granite resulting from the crystallization of magma rich in rare elements
a dark coarse-grained igneous rock consisting principally of olivine
very acid volcanic rock
extrusive igneous rock solidified near or on the surface of the Earth
porphyritic rock, porphyry
any igneous rock with crystals embedded in a finer groundmass of minerals
volcanic rock consisting of large fragments fused together
volcanic rock in which rounded cavities formed by expanding gas have subsequently become filled with mineral deposits
a grey volcanic rock containing plagioclase and quartz and other crystalline minerals
the commonest type of solidified lava; a dense dark grey fine-grained igneous rock that is composed chiefly of plagioclase feldspar and pyroxene
a kind of natural glass produced when molten lava cools very rapidly
plutonic igneous rock having visibly crystalline texture; generally composed of feldspar and mica and quartz
rock that in its molten form (as magma) issues from volcanos; lava is what magma is called when it reaches the surface
hard volcanic rock composed of compacted volcanic ash
a rare type of peridotite that sometimes contains diamonds; found in South Africa and Siberia
material consisting of the aggregate of minerals like those making up the Earth's crust
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