mineral

Tumbled purple chalcedony or low-grade amethyst bead bracelet

Chalcedony (microcrystalline SiO₂), possibly quartz/amethyst; composition is SiO₂

AI-generated identification · may be incorrect

Hardness 6.5–7 Mohs; pale lavender, gray-purple, and bluish-gray colors with waxy to vitreous luster. Quartz has a trigonal crystal structure, but chalcedony is cryptocrystalline and shows no visible cleavage; specific gravity is about 2.58–2.65.

Identified August 29, 2026More mineral →

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At a glance

Common name: Tumbled purple chalcedony or low-grade amethyst bead bracelet
Scientific name: Chalcedony (microcrystalline SiO₂), possibly quartz/amethyst; composition is SiO₂
Category: mineral
Identified: August 29, 2026
Method: Standard

AI Estimated Value

Approximately $5–$25 for a common bracelet; $25–$75 if confirmed natural, well-matched, and made from attractive amethyst or quality chalcedony.

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

Forms when silica-rich groundwater fills cavities and fractures in volcanic rocks, commonly through repeated deposition. The beads are polished and shaped, so their geological age cannot be determined from the image.

Uses & applications

Used for inexpensive jewelry, beads, carvings, and ornamental objects; attractive saturated purple material may be sold as amethyst.

Geological facts

The soft, cloudy appearance and mixed gray-lavender tones are more typical of chalcedony or pale amethyst than gem-grade amethyst. Color may be natural or enhanced by dye or heat treatment.

Field identification & locations

Identify by its glassy/waxy luster, translucency, lack of cleavage, and hardness sufficient to scratch ordinary glass; a gemological test is needed to distinguish chalcedony, amethyst, dyed quartz, and glass. Common sources include Brazil, Uruguay, Madagascar, India, and Mexico.