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 2 O 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 …
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