| General Information |
|---|
| Chemical Formula | | (Ca,Na)(Mg,Fe,Al,Ti)(Si,Al) | | O | | |
Anthony et al, Handbook of mineralogy (2001) |
|---|
| Physical Properties of Augite |
|---|
| Mohs Hardness | 5.5 to 6Anthony et al, Handbook of mineralogy (2001) |
|---|
| Specific Gravity | 3.19 to 3.56Anthony et al, Handbook of mineralogy (2001) |
|---|
| Tenacity | BrittleAnthony et al, Handbook of mineralogy (2001) |
|---|
| Cleavage Quality | GoodAnthony et al, Handbook of mineralogy (2001) |
|---|
| Fracture | Uneven,ConchoidalAnthony et al, Handbook of mineralogy (2001) |
|---|
| Optical Properties of Augite |
|---|
| Refractive Index | 1.671 to 1.774Anthony et al, Handbook of mineralogy (2001) |
|---|
| Optical Character | Biaxial/+Anthony et al, Handbook of mineralogy (2001) |
|---|
| 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) |
|---|
| Dispersion | Weak to moderateAnthony et al, Handbook of mineralogy (2001) |
|---|
| Colour |
|---|
| 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) |
|---|
| Transparency | Transparent,Translucent,OpaqueAnthony et al, Handbook of mineralogy (2001) |
|---|
| Lustre | Vitreous,Resinous,Dull (Earthy)Anthony et al, Handbook of mineralogy (2001) |
|---|
| Crystallography of Augite |
|---|
| Crystal System | MonoclinicAnthony et al, Handbook of mineralogy (2001) |
|---|
| 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) |
|---|
| Geological Environment |
|---|
| 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) |
|---|
| Further Information |
|---|
| Mineral information: | Augite information at mindat.org |
|---|
| Significant Gem Localities |
|---|
|
