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Barite
(barium sulphate)
Color: brown, yellow-brown, colorless, blue,
red or green.
Moh’s hardness: 3
Refractive index: 1.63
Critical angle: 38°
Specific gravity: 4.3-5
Cleavage: Cleaves easily in 2 directions.
Fracture: Brittle, uneven.
Dispersion: Weak
Heat sensitivity: Very high.
Pleochroism: Blue – weak
dichroism.
Birefringence (double refraction): Medium
(.012)
Crystal structure: Orthorhombic
Cutting: Due to extreme brittleness and
cleavage problems, even performing must be done on an extremely fine lap.
Polishing: Wax lap with alumina.
Scratch-free facets may not be obtainable.
OPAL Server
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