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Sinhalite (magnesium aluminum iron borate)
Color: yellow-brown, greenish-brown.
Moh’s hardness: 6.5
Critical angle: 36.5°
Specific gravity: 3.47-3.49
Fracture: Conchoidal, somewhat tough.
Dispersion: Strong (.038)
Heat sensitivity: Low
Pleochroism: Dichroic – Strong (green, light brown and dark brown).
Birefringence (double refraction): None
Crystal structure: Orthorhombic.
Cutting: Cuts like peridot.
Polishing: Alumina on most common polishing laps.