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Encyclopedia Britannica - Main :: MOL-MOS |
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MOONSTONE , a variety of felspar, showing in certain directions a bluish opalescence, whence its value as an ornamental stone. When cut with a convex surface it displays a soft milky reflection, forming a luminous band, but not sharply defined as in cat's-eye. The ordinary moonstone is a translucent variety of orthoclase known as adularia (see ORTnO0LASE), whence the peculiar sheen has been called " adularescence." The effect is probably caused by interference from twin lamellae, or by numerous enclosures of microscopic laminae, definitely orientated, and it has been suggested that these may often be flakes of kaolin
district
original
Lanark
Macomb
York
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