#rock__stone material consisting of the aggregate of minerals like those making up the Earth's crust
supertype: material.substance__stuff the tangible substance that goes into the makeup of a physical object; "coal is a hard black material"; "wheat is the stuff they use to make bread"
substance: mineral
subtype: quartzite hard metamorphic rock consisting essentially of interlocking quartz crystals
subtype: road_metal broken rock used for repairing or making roads
subtype: sedimentary_rock__sedimentaryrock rock formed from consolidated clay sediments
subtype: argillite a sedimentary rock differing from shale in being bound by silica and from slate in having no slate cleavages
subtype: arenaceous_rock a sedimentary rock composed of sand
subtype: sandstone a sedimentary rock consisting of sand consolidated with some cement (clay or quartz etc.)
subtype: firestone a sandstone that withstands intense heat; used to line fireplaces and furnaces and kilns
subtype: holystone a soft sandstone used for scrubbing the decks of a ship
subtype: gritrock__grit__gritstone a hard coarse-grained siliceous sandstone
subtype: brownstone.sandstone a reddish brown sandstone; used in buildings
subtype: bluestone bluish-gray sandstone used for paving and building
subtype: greensand an olive-green sandstone containing glauconite
subtype: siltstone a fine-grained sandstone of consolidated silt
subtype: argillaceous_rock a sedimentary rock formed from clay deposits
subtype: rudaceous_rock__rudaceousrock a sedimentary rock formed of coarse-grained material
subtype: breccia a rudaceous rock consisting of sharp fragments embedded in clay or sand
subtype: slate.sedimentary_rock a fine-grained metamorphic rock that can be split into thin layers
subtype: limestone a sedimentary rock consisting mainly of calcium that was deposited by the remains of marine animals
subtype: shale a sedimentary rock formed by the deposition of successive layers of clay
subtype: oil_shale__oilshale shale from which oil can be obtained by heating
subtype: sial the granite-like rocks that form the outermost layer of the earth's crust; rich in silicon and aluminum
subtype: sima rock that form the continuous lower layer of the earth's crust; rich in silicon and magnesium
subtype: metamorphic_rock__metamorphicrock rock altered by pressure and heat
subtype: amphibolite a metamorphic rock composed chiefly of amphibole and plagioclase
subtype: marlite__marlstone metamorphic rock with approximately the same composition as marl
subtype: hornfels__hornstone a fine-grained metamorphic rock formed by the action of heat on clay rocks
subtype: gneiss a laminated metamorphic rock similar to granite
subtype: schist any metamorphic rock that can be split into thin layers
subtype: gravel__crushed_rock__crushedrock rock fragments and pebbles
subtype: bank_gravel__pit-run_gravel__pitrungravel__pit_run__pitrun gravel as found in natural deposits
subtype: shingle.gravel coarse beach gravel of small water-worn stones and pebbles (or a stretch of shore covered with such gravel)
subtype: caliche nitrate-bearing rock or gravel of the sodium nitrate deposits of Chile and Peru
subtype: shingling.rock (geology) sediment in which flat pebbles are uniformly tilted in the same direction
subtype: pumice_stone__pumice a light glass formed on the surface of some lavas; used as an abrasive
subtype: aphanite fine-grained homogeneous rock (such as basalt) containing minerals undetectable by the naked eye
subtype: claystone fine-grained rock consisting of compacted clay particles
subtype: dolomite.rock a kind of sedimentary rock resembling limestone but consisting almost entirely of the mineral dolomite
subtype: emery_stone__emerystone__emery_rock__emeryrock a mixture of emery dust and a binder; can be molded into grindstones
subtype: pudding_stone__conglomerate a composite rock made up of particles of varying size
subtype: fieldstone stone that occurs naturally in fields; often used as building material
subtype: greisen a granitic rock composed of quartz and mica
subtype: calc-tufa__tufa a soft porous rock consisting of calcium carbonate deposited from springs rich in lime
subtype: magma molten rock in the earth's crust
subtype: igneous_rock__igneousrock rock formed by the solidification of molten magma
subtype: andesite a dark gray volcanic rock
subtype: aplite light-colored and fine-grained granitic rock consisting chiefly of quartz and feldspars
subtype: groundmass the matrix of fine-grained crystalline material in which larger crystals are embedded
subtype: andosite dark grayish extrusive rock
subtype: batholith__batholite__pluton__plutonic_rock large mass of intrusive igneous rock believed to have solidified deep within the earth
subtype: granite.batholith plutonic igneous rock having visibly crystalline texture
subtype: diorite a granular crystalline intrusive rock
subtype: gabbro one of a family of granular intrusive rocks
subtype: pegmatite a form of igneous rock consisting of extremely coarse granite resulting from the crystallization of magma rich in rare elements
subtype: peridotite a dark coarse-grained igneous rock consisting principally of olivine
subtype: kimberlite a rare type of peridotite that sometimes contains diamonds; found in South Africa and Siberia
subtype: rhyolite very acid volcanic rock
subtype: volcanic_rock extrusive igneous rock solidified near or on the surface of the Earth
subtype: basalt the commonest type of solidified lava; a dense dark gray fine-grained igneous rock composed chiefly of calcium-rich plagioclase feldspar and pyroxene
subtype: volcanic_glass a kind of natural glass produced when molten lava cools very rapidly
subtype: obsidian acid or granitic glass; usually dark, but transparent in thin pieces
subtype: pitchstone dark acid granitic glass
subtype: tachylite a basic or basalt glass
subtype: lava rock that in its molten form (as magma) issues from volcanos; lava is what magma is called when it reaches the surface
subtype: pillow_lava lava that hardened in rounded shapes suggestive of pillows; believed to result from underwater eruptions
subtype: tuff__tufa hard volcanic rock composed of compacted volcanic ash
subtype: porphyry__porphyritic_rock__porphyriticrock any igneous rock with crystals embedded in a finer groundmass of minerals
subtype: limestone a sedimentary rock consisting mainly of calcium that was deposited by the remains of marine animals
subtype: marble a hard crystalline metamorphic rock that takes a high polish; used for sculpture and as building material
subtype: verd_antique__verde_antique a dark green impure marble
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