1910–1911
Britannica 11th
Encyclopaedia Britannica · 11th edition
AUGITE, an important member of the pyroxene (?.».) group of rock-forming minerals. The name (from abyii, lustre) has at various times been used in different senses; it is now applied to aluminous pyroxenes of the monoclinic series which are darkgreenish, 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 between which is 87°. A typical crystal is represented in fig. i, whilst fig. 2 shows a crystal twinn…
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- Vol. 2, pp. 901-902