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Ch. 10: Calcite - Labradorite

Ch. 10: Calcite - Labradorite Page of 311 Ch. 10: Calcite - Labradorite Text size:minus plus Restore normal size   Mail page  Print this page
PRECIOUS STONES.
211
The most important variety for the present purpose is the pure Adularia, which is often found in large transparent or sub-transparent crystals attached to the matrix in groups, the crystals often being twinned (Fig. 16). It is of frequent occurrence in the fissures of the gneissose rocks of the Alps. The sub-variety Moonstone shows a peculiar reflection of bluish-white light, which from its common presence in
Adularia is known as adularescence; it is only seen in certain directions and chiefly near the face which is normal to the shorter lateral axis of the crystal. Moonstone, which is also known as Girasol, Wolf's Eye, Ceylonese Opal, and Water Opal, is not only a variety of Adularia; the term refers to the appearance of the stone rather than to its composition, and other Felspars, as Albite and
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Ch. 10: Calcite - Labradorite Page of 311 Ch. 10: Calcite - Labradorite
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