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150 A Book of Precious Stones
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tion
of a porphyritic rock. Ceylon moonstone is sometimes erroneously termed
" Ceylon opal." Albite is found at Mineral Hill, near Media, Delaware
County, Pennsylvania; in Allen's Mica Mine, Amelia Court House,
Virginia; and other localities in North America.
The
term sunstone, or heliolite, is applied to aventurine kinds of
oglioclase, one of the feldspars; these are of a greyish white to
reddish gray colour with internal yellowish or reddish reflections,
proceeding from disseminated crystals or flakes of iron oxide.
Sunstone is found at Lyme, Connecticut, among other American
localities. Its use in jewelry is now very limited; it is not costly,
and artificial "sun-stone " or " goldstone," made of glass, containing
sparkling particles of metal, is often preferred to the genuine,
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