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Beautiful Amethyst plaque from Brazil (old collection).
Stone dimensions: L: 160mm x W: 120mm.
Weight: 1390g.
Chemical formula: SiO2 (silicon dioxide)
Amethyst is a variety of violet quartz: the color is due to traces of iron.
Mohs scale: 7
Density: 2.65
You can consult our article on Amethyst on the blog