#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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