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sunstone

[suhn-stohn] /ˈsʌnˌstoʊn/
noun
1.
a reddish variety of oligoclase feldspar, used as a gem, having a red and bright-yellow play of color.
Origin
1350-1400
1350-1400; Middle English; see sun, stone
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for sun-stone

sunstone

/ˈsʌnˌstəʊn/
noun
1.
another name for aventurine (sense 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
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Encyclopedia Article for sun-stone

sunstone

a gemstone variety of feldspar that has minute platelike inclusions of iron oxide (hematite or goethite) oriented parallel to one another throughout. The reflections from these inclusions give the mineral (usually the plagioclase feldspars albite, oligoclase, or labradorite, but sometimes the alkali feldspar orthoclase) a spangled appearance and often a reddish glow. The stone is often cut en cabochon (i.e., with a rounded and convex polished surface). Sunstone occurs in Tvedestrand, Nor.; near Lake Baikal, Russia; and at Middletown, Pa., and Statesville, N.C., in the United States.

Learn more about sunstone with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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3
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