Roger Weller, geology instructor
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Augite is CaMgSi2O6 with (Mg,Fe)(Al,Fe)2SiO6
Augite is a member of the pyroxene family of silicate minerals. Besides silica, it
contains calcium, magnesium, iron, aluminum, alkalis, and maybe even titanium.
In many ways it resembles hornblende in terms of color and composition. Augite is
distinguished from hornblende by its shorter, stubbier crystals and the fact that its
two cleavage planes are close to a right angle. The color of augite ranges from
black to a dark green.
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