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microcrystalline form of Quartz
making it a very unique stone
and this phenomenon is thought to be due to impurities of yttrium or organic matter within the crystal lattice
Calcite is the principal constituent of limestone and marble
Smoky Quartz 3x4mm Banded Faceted Rondelle A Grade - 15-16 Inch HPS06162022 microcrystalline form of QuartzSmoky Quartz is a translucent smoky brown or gray variety of Quartz. It ranges from almost completely transparent to an almost opaque brownish to gray crystal. The color of Smoky Quartz is due to natural irradiation and traces of aluminum within the crystal lattice of the stone. Smoky Quartz it the national gem of Scotland, where it was mined since around 300 BCE.
