mineral

Mixed mineral and rock collection, including likely amethyst and assorted tumbled stones

Unidentified mixed specimens; visible purple quartz is likely amethyst (SiO₂)

AI-generated identification · may be incorrect

The pieces vary in color, grain, and luster; the rough purple crystal appears quartz-like (Mohs 7, vitreous luster, trigonal crystal system, no cleavage). Other specimens are too small or indistinct to identify reliably from the image.

Identified September 27, 2026More mineral →

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At a glance

Common name: Mixed mineral and rock collection, including likely amethyst and assorted tumbled stones
Scientific name: Unidentified mixed specimens; visible purple quartz is likely amethyst (SiO₂)
Category: mineral
Identified: September 27, 2026
Method: Standard

AI Estimated Value

Approximately $1–$20 for the assorted small pieces; the rough purple specimen may be worth more depending on confirmed identity, 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

This is a collection rather than one rock type; specimens may represent several geological ages and formation settings, including quartz-bearing veins and sedimentary or metamorphic rocks. Some pieces appear polished or tumbled.

Uses & applications

Common uses of comparable specimens include collecting, jewelry, decoration, and lapidary practice; specific uses depend on identification.

Geological facts

The image shows a loose assortment of small stones and crystals, with a separate pale-purple rough specimen and a cluster of polished stones at lower left.

Field identification & locations

A closer view of individual pieces, especially fresh surfaces and crystal shapes, is needed for field identification; color alone is not diagnostic. Quartz amethyst is widespread in Brazil, Uruguay, and other regions.