Definitions

from The Century Dictionary.

  • noun A variety of opal, often called pearl-opal, usually milk-white, sometimes grayish- or yellowish-white, in color, and opaque or slightly translucent at the edges.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Min.) An opaque or milk-white chalcedony, a variety of quartz; also, a similar variety of opal.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun mineralogy An opaque or milk-white chalcedony, a variety of quartz.
  • noun mineralogy A similar variety of opal.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

From French cacholong, said to be from Cach, the name of a river in Bucharia + cholon, a Calmuck word for stone; or from a Calmuck word meaning "beautiful stone".

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