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Hauynite
(Sodium aluminum calcium sulfo-silicate)
Color: Blue to greenish blue.
Moh’s hardness: 5.5-6
Refractive index: 1.49
Critical angle: 42°
Specific gravity: 2.4-2.5
Cleavage: Moderate in six directions.
Fracture: Uneven
Heat sensitivity: Low
Crystal structure: Isometric
Cutting: Cutting is fairly straightforward.
Polishing: Polishes easily with alumina
tin/lead or chrome oxide Ultralaps.
Comments: Rarely found in anything but very
small stones. Hauynite is a
constituent of lapis lazuli.
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