Information
Specific Gravity: 3.64 ( -0.03 / +0.03 )
Hardness: 6.0 - 6.5
Refractive Index: 1.756 - 1.804
Birefringence: 0.046
Crystal System: Hexagonal
Luster: Vitreous
Chemical Composition: BaTiSi₃O₉
Optical Character: Uniaxial (+)
Pleochroism: Strong, Usually Blue And Colorless
Transparency: Transparent, Translucent
Color: Colorless, Blue, Purple, Pink.
Remark: Under Short Wave Ultraviolet Strong Blue