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sunstone

[suhn-stohn]
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noun
  1. a reddish variety of oligoclase feldspar, used as a gem, having a red and bright-yellow play of color.

Origin of sunstone

Middle English word dating back to 1350–1400; see origin at sun, stone
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for sunstone

sunstone

noun
  1. another name for aventurine (def. 2)

Word Origin

C17: so called because it contains red and gold flecks which reflect the light
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012