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Augite

The Pyroxene Minerals

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Augite is the most common pyroxene, with the formula (Ca,Na)(Mg,Fe,Al,Ti)(Si,Al)2O6. Augite is usually black, with stubby crystals. It is a common primary mineral in basalt, gabbro and peridotite and a high-temperature metamorphic mineral in gneiss and schist.
The default mafic pyroxene
Photo courtesy Krzysztof Pietras of Wikimedia Commons

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