• A chalcedony that occurs in bands of different colors and is used as a gemstone, especially in cameos and intaglios.
  • A variety of quartz, closely allied to agate, characterized by a structure in parallel bands differing in color or in degree of translucency: in the better kinds the layers are sharply defined and the colors white with black, brown, or red.
  • An infiltration of pus between he layers of the cornea, resembling a nail.
  • In <em>conchology</em>: The piddock, <em>Pholas dactylus.</em>
  • A razor-shell; a bivalve of the family <em>Solenidæ.</em>
  • Deep, jet-black.
  • Chalcedony in parallel layers of different shades of color. It is used for making cameos, the figure being cut in one layer with the next as a ground.
  • Same as Mexican onyx.
  • A deep jet-black color.
  • a banded variety of marble or calcium carbonate resembling onyx. It is obtained from Mexico in various colors ranging from white to deep black.
  • None
  • A banded variety of <xref>chalcedony</xref>, a <xref>cryptocrystalline</xref> form of <xref>quartz</xref>.
  • <xref>jet-black</xref>
  • a chalcedony with alternating black and white bands; used in making cameos
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