Turquoise Gold Jewellery Necklace Set
By Mans Women Jewellery
The finest of turquoise reaches a maximum Mohs hardness of just under 6, or slightly more than window glass. Characteristically a cryptocrystalline mineral, turquoise almost never forms single crystals, and all of its properties are highly variable. X-ray diffraction testing shows its crystal system to be triclinic.] With lower hardness comes lower specific gravity (2.60–2.90) and greater porosity; these properties are dependent on grain size.
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