Glass Rough
Chemical Formula: Al2Be3Si6O18, Aluminium beryllium silicate
Crystal Structure: Hexagonal, hexagonal prisms
Hardness: 7 on the Mohs scale
Refractive Index: 64 Ð 1.596
Density: 68 Ð 2.74
Cleavage: Indistinct
Transparency: Transparent to opaque
Double Refraction / Birefringence: -0.004 to -0.005
Luster: Vitreous
Fluorescence: None
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