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A variety of pyroxene, usually of a black or dark green color, occurring in igneous rocks, such as basalt; -- also used instead of the general term pyroxene.

Pertaining to, or like, augite; containing augite as a principal constituent; as, augitic rocks.

A rock of igneous origin, consisting of augite and triclinic feldspar, with grains of magnetic or titanic iron, and also bottle- green particles of olivine frequently disseminated.

A grayish or greenish compact rock, composed of feldspar and augite, and allied to basalt.

emical composition, though similar or indentical in certain other respects; as, borax and augite are homoemorphous, but heteromerous.

A dark green igneous rock, consisting largely of chrysolite, with hornblende, augite, biotite, etc.

A rock with a porphyritic structure; as, augite porphyrite.

, that is, characterized by the presence of distinct crystals, as of feldspar, quartz, or augite, in a relatively fine-grained base, often aphanitic or cryptocrystalline.

varieties differing in color and composition, as diopside, malacolite, salite, coccolite, augite, etc. They are all silicates of lime and magnesia with sometimes alumina and iron. Pyroxene is an essential constituent of many rocks, especially basic igneous rocks, as basalt, gabbro, etc.