Pyroxene is a silicate mineral with the general composition (Mg,Fe)SiO3. Though the basic formula is simple, it is said to be a complex class of minerals. The most common member of the group is augite, which forms dark crystals as a result of the iron and magnesium content. It is said to a ferromagnesian or "mafic" mineral which has a high crystallization temperature and is formed early in the Bowen reaction series.

Selection of common minerals

Lutgens & Tarbuck
Ch 2
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