mineral
Tumbled purple stone, likely amethyst-bearing quartzite or dyed quartz
Quartz (SiO₂), possibly microcrystalline quartzite; purple color may be from iron-related amethyst or artificial dye
AI-generated identification · may be incorrectOpaque, rounded, matte-to-waxy surface with lavender-purple coloration; quartz hardness is Mohs 7, vitreous when freshly fractured, with no cleavage and conchoidal fracture. The image is insufficient to confirm crystal structure or specific gravity.
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Physical properties
Opaque, rounded, matte-to-waxy surface with lavender-purple coloration; quartz hardness is Mohs 7, vitreous when freshly fractured, with no cleavage and conchoidal fracture. The image is insufficient to confirm crystal structure or specific gravity.
Formation & geological history
If natural, quartz formed from silica-rich fluids or recrystallized sandstone, with purple coloration commonly linked to iron impurities and irradiation; quartzites may be Precambrian to younger. A uniformly vivid color could indicate dyeing or coating.
Uses & applications
Commonly sold as a tumbled ornamental stone, pocket stone, or craft material; quartz varieties are also used in abrasives, glass, electronics, and jewelry.
Geological facts
The rounded shape indicates mechanical tumbling rather than natural weathering. Amethyst is crystalline quartz, whereas quartzite is a metamorphic rock composed mainly of interlocking quartz grains.
Field identification & locations
Likely identification requires a white-streak test, hardness test against glass, inspection of chips for dye concentration, and magnification for quartz grains or crystals. Common sources include Brazil, Uruguay, Madagascar, and India.
