Amethyst Diamond Gold Jewellery Ring.
Diaphaneity Transparent to translucent
Specific gravity 2.65 constant; variable in impure varieties
Optical properties Uniaxial (+)
Refractive index nω = 1.543–1.553
nε = 1.552–1.554
Birefringence +0.009 (B-G interval)
Pleochroism None
Melting point 1650±75 °C
Solubility Insoluble in common solvents
Other characteristics Piezoelectric
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