augite
augite An important member of the
pyroxene group of silicate minerals, occupying a field of composition within the
calc-alkaline pyroxenes between the
diopsides and the
pigeonite field, and with the formula Ca(Mg,Fe)Si
2O
6 (Na may substitute for Ca and Al for Si; and a large increase in the amount of Na and Fe
3+ (for Fe
2+) gives aegirine augite (Na,Ca)(Fe
3+,Mg,Fe
2+)Si
2O
6, an important pyroxene in
alkaline rocks); sp. gr. 3.3;
hardness 6.0;
monoclinic; greenish-black;
crystals short,
prismatic; a common constituent of
basic igneous rocks but may also occur in high-grade
metamorphic rocks. See also
CLINOPYROXENE.
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