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To: Squawk 8888
That's Labradorite feldspar, not calcite. Labradorite was named after Labrador, where it was first identified, but it occurs worldwide. Fine gem-grade material also comes from Finland, India and Madagascar. It also occurs in transparent yellow hues.

"Sunstone" is a popular current misnomer for other varieties of feldspar, particularly material from India with bright spangles of mica, and for beautiful copper-infused material of many hues from Oregon, USA. Another gem-grade spangled variety occurs in Tanzania.

As used in Viking lore, the word "Sunstone" referred to some kind of stone (believed by some to be the mineral Iolite) that was used to find the sun on cloudy or foggy days. That name has nothing to do with current usage.

Calcite ("Iceland Spar")is an entirely separate mineral. It is also doubly-refractive and splits light into two beams traveling at different angles through it. One of my friends has created this information about it the fabled Viking "Sunstone": The Viking Compass

27 posted on 03/08/2013 1:57:13 PM PST by Bernard Marx
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To: Bernard Marx

great link, thanks.


38 posted on 03/08/2013 4:36:54 PM PST by visualops (artlife.us)
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