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 incorrect

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.

Identified September 16, 2026More mineral →

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At a glance

Common name: Tumbled purple stone, likely amethyst-bearing quartzite or dyed quartz
Scientific name: Quartz (SiO₂), possibly microcrystalline quartzite; purple color may be from iron-related amethyst or artificial dye
Category: mineral
Identified: September 16, 2026
Method: Standard

AI Estimated Value

About $1–$10 for a common tumbled stone; $10–$30 if confirmed natural, attractive amethyst or collectible quartzite.

Not an official valuation

AI estimate for general interest only — not an appraisal. Actual value depends on condition, provenance, and market demand. Verify with a professional before buying, selling, or insuring.

This identification was generated by AI and may contain errors. Verify important details before relying on them — and never use an AI result to judge whether a specimen is safe to handle. Read the full disclaimer

Physical properties

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.