sun stone

sunstone

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

Origin:
1350–1400; Middle English; see sun, stone

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World English Dictionary
sunstone (ˈsʌnˌstəʊn)
 
n
another name for aventurine
 
[C17: so called because it contains red and gold flecks which reflect the light]

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