sunstone


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sunstone.

1 Crystal mineral thought by some to have been used by the Vikings as an aid to navigation, especially in conditions of low visibility due to clouds or fog when the position of the sun was uncertain. Both Iceland sparIceland spar,
colorless variety of crystallized calcite, characterized by its properties of transparency and double refraction. It is used chiefly in the manufacture of Nicol prisms, which are essential parts of polarizing microscopes and other optical instruments.
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 and cordierite, which have optical properties that cause rays of light to show different properties in different directions, thus permitting an observer to determine the position of the sun, have been suggested as candidates for the sunstone. 2 A reddish or golden form of a plagioclase feldsparfeldspar
or felspar
, an abundant group of rock-forming minerals which constitute 60% of the earth's crust. Chemically the feldspars are silicates of aluminum, containing sodium, potassium, iron, calcium, or barium or combinations of these elements.
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 that is used as a gemstone.

sunstone

[′sən ‚stōn]
(mineralogy)
An aventurine feldspar containing minute flakes of hematite; usually brilliant and translucent, it emits reddish or golden billowy reflection. Also known as heliolite.
References in periodicals archive ?
Sunstone has a 90 day period to make an election to proceed to 70% ownership
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The Sunstone Acceptance financing program can be used by participating funeral homes that have access to the web.
In 2011, a research team led by a French physicist named Guy (http://rspa.royalsocietypublishing.org/content/early/2011/10/28/rspa.2011.0369) Ropars built a sunstone using a bit of Iceland spar set into a wooden case that directed light from the sky onto the crystal.
Scientists have been trying to find evidence of the so-called sunstone after it was described in one Icelandic saga as a magical gem which, when held up to sky, would reveal the position of the sun even before dawn or after sunset.
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A successor firm, Wyndham International, sold it along with 10 other hotels in 2002 to Sunstone.
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