monoclinic Inosilicates
Augite (Prismatic)
(Ca,Na)(Mg,Fe,Al)(Si,Al)2O6
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}
Quick Facts
Hardness
5.5
Specific Gravity
3.2
Refractive Index
1.68
Optical Character
Biaxial +
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Open in PlaygroundPhysical 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
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Open in PlaygroundRelated Minerals
Other minerals in the monoclinic system
