| General Information |
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| Chemical Formula | | (Ca,Na)(Mg,Fe,Al,Ti)(Si,Al) | | O | | |
Anthony et al, Handbook of mineralogy (2001) |
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| Physical Properties of Augite |
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| Mohs Hardness | 5.5 to 6Anthony et al, Handbook of mineralogy (2001) |
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| Specific Gravity | 3.19 to 3.56Anthony et al, Handbook of mineralogy (2001) |
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| Tenacity | BrittleAnthony et al, Handbook of mineralogy (2001) |
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| Cleavage Quality | GoodAnthony et al, Handbook of mineralogy (2001) |
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| Fracture | Uneven,ConchoidalAnthony et al, Handbook of mineralogy (2001) |
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| Optical Properties of Augite |
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| Refractive Index | 1.671 to 1.774Anthony et al, Handbook of mineralogy (2001) |
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| Optical Character | Biaxial/+Anthony et al, Handbook of mineralogy (2001) |
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| Pleochroism | Pale green, pale brown, green, greenish yellow - pale brown, pale yellow-green, violet - pale green, grayish green, violet.Anthony et al, Handbook of mineralogy (2001) |
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| Dispersion | Weak to moderateAnthony et al, Handbook of mineralogy (2001) |
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| Colour |
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| Colour (General) | Black, brown, greenish, violet-brown; in thin section, colorless to gray; clear cores zoned to dark rims common, also oscillatory and sector zoning.Anthony et al, Handbook of mineralogy (2001) |
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| Transparency | Transparent,Translucent,OpaqueAnthony et al, Handbook of mineralogy (2001) |
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| Lustre | Vitreous,Resinous,Dull (Earthy)Anthony et al, Handbook of mineralogy (2001) |
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| Crystallography of Augite |
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| Crystal System | MonoclinicAnthony et al, Handbook of mineralogy (2001) |
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| Habit | Stubby prismatic crystals, square or octagonal in section, to 10 cm; elongated, acicular, skeletal, dendritic. Exsolution lamellae and overgrowths commonAnthony et al, Handbook of mineralogy (2001) |
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| Geological Environment |
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| Where found: | Essential in mafic igneous rocks, basalt, gabbro; common in ultramafic rocks; in some high-grade metamorphic rocks and metamorphosed iron formations.Anthony et al, Handbook of mineralogy (2001) |
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| Further Information |
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| Mineral information: | Augite information at mindat.org |
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