#glass__glas  a brittle transparent solid with irregular atomic structure
  supertype:  solid  a substance that is solid at room temperature and pressure
  part of:  drinking_glass
  substance of:  glassware  plate_glass
  subtype:  natural_glass__naturalglas  magma of any composition that cooled very rapidly
     subtype:  quartz_glass__quartz__vitreous_silica__lechatelierite__crystal  colorless glass made of almost pure silica
     subtype:  tektite  thought to derive from meteorites
  subtype:  opal_glass__milk_glass  a milky white translucent or opaque glass
  subtype:  optical_glass__opticalglas  clear homogeneous glass of known refractive index; used to make lenses
     subtype:  optical_crown__opticalcrown__crown_glass__crownglas  optical glass of low dispersion and low refractive index
     subtype:  optical_flint__opticalflint__flint_glass__flintglas  optical glass of high dispersion and high refractive index
  subtype:  crown_glass__crownglas  a glass blown into a globe which is later flattened and spun to form a disk
  subtype:  soft_glass  glass having a relatively low softening point
  subtype:  ground_glass  glass that diffuses light due to a rough surface produced by abrasion or etching
  subtype:  ground_glass.glass__groundglas  particulate glass made by grinding and used as an abrasive
  subtype:  lead_glass  glass containing lead oxide; has a high refractive index
  subtype:  safety_glass__laminated_glass__shatterproof_glass  glass made with plates of plastic or resin or other material between two sheets of glass to prevent shattering
  subtype:  soluble_glass__water_glass__waterglas__sodium_silicate  a viscous glass consisting of sodium silicate in solution; used as a cement or as a protective coating and to preserve eggs
  subtype:  stained_glass__stainedglas  glass that has been colored in some way; used for church windows
     subtype:  Tiffany_glass  a kind of opalescent colored glass that was used in the early 1900s for stained-glass windows and lamps
  subtype:  wire_glass  a glass that contains a layer of wire netting in it
  subtype:  Pyrex  (trademark) a borosilicate glass with a low coefficient of expansion; used for heat-resistant glassware in cooking and chemistry

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