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Augite Pictures

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Massive Augite showing cleavage directions. 

Stubby, prismatic crystals of Augite.

More crystals of Augite

CHEMISTRY (Ca,Na)(Mg,Fe,Al,Ti)(Si,Al)₂O₆  

CRYSTALLOGRAPHY Monoclinic 

CRYSTAL GROWTH AND HABITS Augite forms stubby prismatic crystals and can also be found as granular to massive.

COLOR AND OTHER OPTICAL PROPERTIES Black to yellow brown 

HARDNESS 5 - 6       

SPECIFIC GRAVITY 3.2 - 3.4        

LUSTER Augite is vitreous to subvitreous and dull, it may also be resinous.  It is translucent to opaque.

STREAK Gray green

BREAKABILITY Augite has good prismatic cleavage (two directions) at nearly 90^o (87^o and 93^o).

OCCURRENCE Augite is an important rock forming mineral in mafic and ultramafic igneous rocks.  It is also found in high temperature metamorphic rocks.

ASSOCIATED MINERALS Orthoclase, Sanidine, Labradorite, Olivine, Amphiboles and Pyroxenes.