- Types:
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quartzite
hard metamorphic rock consisting essentially of interlocking quartz crystals
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road metal
broken rock used for repairing or making roads
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sedimentary rock
rock formed from consolidated clay sediments
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sial
the granitelike rocks that form the outermost layer of the earth's crust; rich in silicon and aluminum
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sima
rock that form the continuous lower layer of the earth's crust; rich in silicon and magnesium
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metamorphic rock
rock altered by pressure and heat
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crushed rock, gravel
rock fragments and pebbles
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caliche
nitrate-bearing rock or gravel of the sodium nitrate deposits of Chile and Peru
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shingling
(geology) sediment in which flat pebbles are uniformly tilted in the same direction
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pumice, pumice stone
a light glass formed on the surface of some lavas; used as an abrasive
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aphanite
fine-grained homogeneous rock (such as basalt) containing minerals undetectable by the naked eye
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claystone
fine-grained rock consisting of compacted clay particles
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dolomite
a kind of sedimentary rock resembling marble or limestone but rich in magnesium carbonate
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emery rock, emery stone
a mixture of emery dust and a binder; can be molded into grindstones
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conglomerate, pudding stone
a composite rock made up of particles of varying size
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fieldstone
stone that occurs naturally in fields; often used as building material
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greisen
a granitic rock composed of quartz and mica
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calc-tufa, tufa
a soft porous rock consisting of calcium carbonate deposited from springs rich in lime
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magma
molten rock in the earth's crust
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igneous rock
rock formed by the solidification of molten magma
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limestone
a sedimentary rock consisting mainly of calcium that was deposited by the remains of marine animals
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marble
a hard crystalline metamorphic rock that takes a high polish; used for sculpture and as building material
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matrix
(geology) amass of fine-grained rock in which fossils, crystals, or gems are embedded
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amphibolite
a metamorphic rock composed chiefly of amphibole and plagioclase
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argillite
a sedimentary rock differing from shale in being bound by silica and from slate in having no slate cleavages
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arenaceous rock
a sedimentary rock composed of sand
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argillaceous rock
a sedimentary rock formed from clay deposits
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rudaceous rock
a sedimentary rock formed of coarse-grained material
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marlite, marlstone
metamorphic rock with approximately the same composition as marl
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hornfels, hornstone
a fine-grained metamorphic rock formed by the action of heat on clay rocks
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ballast
coarse gravel laid to form a bed for streets and railroads
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bank gravel, pit run, pit-run gravel
gravel as found in natural deposits
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shingle
coarse beach gravel of small waterworn stones and pebbles (or a stretch of shore covered with such gravel)
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slate
a fine-grained metamorphic rock that can be split into thin layers
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andesite
a dark grey volcanic rock
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aplite
light-colored and fine-grained granitic rock consisting chiefly of quartz and feldspars
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gneiss
a laminated metamorphic rock similar to granite
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schist
any metamorphic rock that can be split into thin layers
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groundmass
(geology) the matrix of fine-grained crystalline material in which larger crystals are embedded
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adesite
dark greyish extrusive rock
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batholite, batholith, pluton, plutonic rock
large mass of intrusive igneous rock believed to have solidified deep within the earth
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diorite
a granular crystalline intrusive rock
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gabbro
one of a family of granular intrusive rocks
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pegmatite
a form of igneous rock consisting of extremely coarse granite resulting from the crystallization of magma rich in rare elements
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peridotite
a dark coarse-grained igneous rock consisting principally of olivine
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rhyolite
very acid volcanic rock
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volcanic rock
extrusive igneous rock solidified near or on the surface of the Earth
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rottenstone, tripoli
a weathered and decomposed siliceous limestone; in powdered form it is used in polishing
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verd antique, verde antique
a dark green impure marble
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porphyritic rock, porphyry
any igneous rock with crystals embedded in a finer groundmass of minerals
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shale
a sedimentary rock formed by the deposition of successive layers of clay