mineral

Mixed tumbled stones, likely rose quartz and purple quartz/amethyst

Quartz (SiO₂), including amethyst and probable rose quartz; exact identification is uncertain from the blurred image

AI-generated identification · may be incorrect

Quartz has Mohs hardness 7, vitreous luster, conchoidal fracture, and no cleavage. The pale pink pieces may be rose quartz; purple-brown pieces may be amethyst or dyed quartz, while white pieces could be quartz, calcite, or ceramic-like nongeological material.

Identified August 26, 2026More mineral →

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At a glance

Common name: Mixed tumbled stones, likely rose quartz and purple quartz/amethyst
Scientific name: Quartz (SiO₂), including amethyst and probable rose quartz; exact identification is uncertain from the blurred image
Category: mineral
Identified: August 26, 2026
Method: Standard

AI Estimated Value

About $1–$10 for a small mixed lot; $5–$25 for attractive polished amethyst or rose quartz pieces.

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

Quartz forms in igneous, hydrothermal, and metamorphic environments over a wide range of geological ages; amethyst commonly develops in volcanic cavities. Tumbled specimens are mechanically polished rather than naturally rounded.

Uses & applications

Used for jewelry, ornaments, lapidary crafts, and mineral collecting; common tumbled pieces have modest commercial value.

Geological facts

Amethyst’s purple color is caused mainly by iron impurities and irradiation. Rose quartz is usually massive rather than composed of visible crystals.

Field identification & locations

Confirm quartz with a glass-scratch test: quartz scratches ordinary glass, whereas calcite does not. Common sources include Brazil, Uruguay, Madagascar, India, and the United States.