mineral

Polished/tumbled stones, likely quartz varieties

Likely quartz (SiO₂), with the left specimen possibly rose quartz or orange calcite; exact identification is uncertain from the image

AI-generated identification · may be incorrect

Rounded, polished surfaces; left stone is pale peach-orange and translucent, while the right is tan-brown and cloudy. Quartz has Mohs hardness 7, vitreous luster, hexagonal crystal structure, and no cleavage; calcite is softer (Mohs 3) with rhombohedral cleavage.

Identified September 22, 2026More mineral →

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At a glance

Common name: Polished/tumbled stones, likely quartz varieties
Scientific name: Likely quartz (SiO₂), with the left specimen possibly rose quartz or orange calcite; exact identification is uncertain from the image
Category: mineral
Identified: September 22, 2026
Method: Standard

AI Estimated Value

About $5–$30 each for ordinary polished specimens; larger, unusually translucent, or well-colored pieces may sell for $40–$100.

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

These are likely natural mineral specimens shaped by tumbling and polishing, rather than intact geological rocks. Quartz formed in hydrothermal veins or pegmatites; calcite commonly formed in limestone cavities and veins.

Uses & applications

Used as decorative stones, paperweights, display specimens, and occasionally in jewelry or metaphysical collections. Common polished pieces have modest commercial value.

Geological facts

The image does not show enough detail for a confident species identification; hardness and an acid test would distinguish quartz from calcite.

Field identification & locations

Common sources include Brazil, Madagascar, the United States, Mexico, and South Africa. Test an inconspicuous area for scratching with steel and observe whether dilute hydrochloric acid fizzes (calcite only).