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ASTERIA

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Originally appearing in Volume V02, Page 792 of the 1911 Encyclopedia Britannica.
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ASTERIA , or See also:

STAR-See also:STONE (from Gr. do-rip, star), a name applied to such ornamental stones as exhibit when cut en cabochon a luminous star. The typical asteria is the star-See also:sapphire, generally a bluish-See also:grey See also:corundum, milky or opalescent, with a star of six rays. (See SAPPHIRE.) In red corundum the stellate reflexion is less See also:common, and hence the star-See also:ruby occasionally found with the star-sapphire in See also:Ceylon is among the most valued of " See also:fancy stones." When the See also:radiation is shown by yellow corundum, the stone is called star-See also:topaz. ;Cymophane, or chatoyant See also:chrysoberyl, may also be asteriatedi In all these cases the asterism is due to the reflexion of See also:light from twin-lamellae or from See also:fine tubular cavities or thin enclosures definitely arranged in the stone. The astrion of See also:Pliny is believed to have been our See also:moonstone, since it is described as a colourless stone from See also:India having within it the See also:appearance of a star shining with the light of the See also:moon. All star-stones were formerly regarded with much superstition.

End of Article: ASTERIA

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