mineral

Mixed polished and tumbled mineral specimens, prominently amethyst

Amethyst: purple quartz, SiO₂; accompanying pieces may include jasper, agate, aventurine, tiger’s eye, and other lapidary stones

AI-generated identification · may be incorrect

The foreground specimen is translucent purple amethyst with vitreous luster, hardness 7 Mohs, trigonal quartz structure, no cleavage, and conchoidal fracture; its precise identity is uncertain for the other polished stones from the image alone.

Identified August 28, 2026More mineral →

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At a glance

Common name: Mixed polished and tumbled mineral specimens, prominently amethyst
Scientific name: Amethyst: purple quartz, SiO₂; accompanying pieces may include jasper, agate, aventurine, tiger’s eye, and other lapidary stones
Category: mineral
Identified: August 28, 2026
Method: Standard

AI Estimated Value

Approximately $5–$30 for common polished pieces; $20–$150+ for larger, vivid, well-patterned amethyst specimens, depending on size and quality.

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

Amethyst forms when iron-bearing quartz crystallizes in silica-rich volcanic cavities, commonly in basaltic geodes; many deposits formed during the Mesozoic to Cenozoic, depending on locality. The other pieces likely represent varied igneous, metamorphic, and silica-rich materials.

Uses & applications

Used for cabochons, jewelry, carvings, ornamental objects, meditation stones, and mineral collecting; quartz is also important industrially in glass, electronics, and abrasives.

Geological facts

Purple color results mainly from iron impurities and irradiation; heating can turn amethyst yellow or orange, producing citrine-like material.

Field identification & locations

Identify amethyst by its purple color, glassy luster, translucency, hardness, and absence of cleavage; common sources include Brazil, Uruguay, Zambia, and Bolivia. The tray appears to contain polished or tumbled specimens rather than natural crystal faces.