#chalcedony__calcedony  a milky or grayish translucent to transparent quartz
  supertype:  #quartz  #transparent_gem
  subtype:  #agate  an impure form of quartz consisting of banded chalcedony; used as a gemstone and for making mortars and pestles
     subtype:  #moss_agate  an agate with brown, black, or green moss-like markings
  subtype:  #bloodstone__heliotrope  green chalcedony with red spots that resemble blood
  subtype:  #carnelian__cornelian  a translucent red or orange variety of chalcedony
  subtype:  #chrysoprase  a green variety of chalcedony valued as a gemstone
  subtype:  #onyx  a chalcedony with alternating black and white bands; used in making cameos
     subtype:  #sardonyx  an onyx characterized by parallel layers of sard and a different colored mineral
  subtype:  #plasma.chalcedony  a green slightly translucent variety of chalcedony used as a gemstone
  subtype:  #sard__sardine__sardiu  a deep orange-red variety of chalcedony

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