Information
Specific Gravity: 2.56 ( -0.02 / +0.02 )
Hardness: 6.0 - 6.5
Refractive Index: 1.522 - 1.530 ( -0.004 / +0.004 )
Birefringence: 0.008
Crystal System: Triclinic
Luster: Vitreous To Greasy
Chemical Composition: KAISi₃O₈
Optical Character: Biaxial (-)
Pleochroism: None
Transparency: Translucent To Opaque
Color: White, Dark Green To Greenish-Blue, Grey, Greyish-Yellow.
Remark: -