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Encyclopedia Britannica - Main :: AUD-BAI |
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AUGITE , an important member of the pyroxene
rock
series which are dark-greenish, brownish or black in colour. Like the other pyroxenes it is characterized crystallographically by its distinct cleavages parallel to the prism-faces (M), the angle
the orthopinacoid (r'). Such crystals, of short prismatic habit and black in colour, are common as phenocrysts in many basalts, and are hence known as " basaltic augite ": when the containing rock
augite is left as black FIG. I. FIG. 2. isolated crystals, and such specimens, usually from Bohemia, are represented in all mineral
Tirol
epidote
appearance .Chemically, augite resembles diopside
and jadeite (NaAlSi2O6) molecules are also sometimes present. Variations in the amount of iron in mixtures of these isomorphous molecules are accompanied by variations in the optical characters of the augite. (L. J. S.) End of Article: AUGITE If you wish, you can link directly to this article.
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