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Danburite
(calcium borosilicate)
Color: Colorless, pink, wine-yellow and
brownish.
Moh’s hardness: 7
Refractive index: 1.63-1.636
Critical angle: 38°
Specific gravity: 3.0
Cleavage: Imperfect
Fracture: Uneven, conchoidal
Dispersion: Medium (.017)
Heat sensitivity: None
Pleochroism: Weak (pale to lighter color).
Birefringence (double refraction): Weak
(.006)
Crystal structure: Orthorhombic
Cutting: Cutting danburite is fairly
straightforward.
Polishing: Alumina or diamond on most common
polishing laps.
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