AMETHYST

CLASS: Oxide. . . CHEMICAL FORMULA: SiO2. . . CRYSTAL SYSTEM: trigonal
QUARZ macrocrystalline variety
COLOR: violet
PHYSICAL PROPERTIES: very hard (7 Mohs), light (2,65 g/cm3), lack of cleavage, translucent, with a vitreous luster.
CURIOSITIES: related to harmony and relaxation.

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