monoclinic Inosilicates
Augite (Prismatic)
(Ca,Na)(Mg,Fe,Al)(Si,Al)2O6
Quick Facts
Hardness
5.5
Specific Gravity
3.2
Refractive Index
1.68
Optical Character
Biaxial +
Crystal Structure
#! Species: Augite
#! System: Monoclinic (2/m)
#! Habit: Short prismatic monoclinic
monoclinic[2/m]:{010}@1.0 + {110}@0.8 + {100}@0.6 + {001}@0.4
monoclinic
2/m
{010} {110} {100} {001}
Physical Properties
Crystal Systemmonoclinic
Hardness (Mohs)5.5
Specific Gravity3.2
CleavageGood {110} at ~87°
FractureUneven to conchoidal
LustreVitreous to resinous
Optical Properties
Refractive Index1.68
Birefringence0.023
Optical CharacterBiaxial +
Colours
Dark greenBlackBrown
Localities
Worldwide (common rock-forming mineral)Italy (Vesuvius)Canada
Common Inclusions
Exsolution lamellae
Known Treatments
None
Crystal Forms
prismpinacoid
Interactive Preview
Open this crystal in the CDL Playground to rotate, export, and explore in 3D.
Open in Playground #! Species: Augite
#! System: Monoclinic (2/m)
#! Habit: Short prismatic monoclinic
monoclinic[2/m]:{010}@1.0 + {110}@0.8 + {100}@0.6 + {001}@0.4
Related Minerals
Other minerals in the monoclinic system
