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satin spar

noun, Mineralogy
a fibrous variety of gypsum having a silky luster, used as a gem.
Origin of satin spar
1795-1805 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for satin spar
  • Gypsum white satin spar and alabaster as thin lenses and veins in uppermost part.
  • There are three polymorphs- selenite, satin spar, and alabaster.

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