#igneous_rock__igneousrock  rock formed by the solidification of molten magma
  supertype:  rock__stone  material consisting of the aggregate of minerals like those making up the Earth's crust
  substance:  sodalite
  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

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