mineral

Tumbled cream-colored stone, likely quartz or chalcedony

Microcrystalline quartz (chalcedony), SiO₂; exact identification is uncertain from the image

AI-generated identification · may be incorrect

Smooth, rounded, opaque cream-white pebble with a dull to weakly waxy luster and no visible grains or cleavage. Expected hardness about 6.5–7 Mohs and specific gravity near 2.6; it may also be a soft limestone pebble if it scratches easily.

Identified September 8, 2026More mineral →

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At a glance

Common name: Tumbled cream-colored stone, likely quartz or chalcedony
Scientific name: Microcrystalline quartz (chalcedony), SiO₂; exact identification is uncertain from the image
Category: mineral
Identified: September 8, 2026
Method: Standard

AI Estimated Value

$1–$5 as a common pebble or tumbled stone; up to about $10 if attractive chalcedony, though confirmation would require hardness and acid tests.

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

Likely naturally water-rounded material or a tumbled specimen. If chalcedony, it formed from silica-rich fluids filling cavities or fractures, commonly in volcanic rocks; if limestone, it formed as carbonate sediment and later lithified.

Uses & applications

Common chalcedony is used for carvings, cabochons, beads, and decorative stone; limestone is used for aggregate and cement. This small piece has little commercial value.

Geological facts

The photograph does not show diagnostic crystal faces, banding, or fossils, so a precise identification is not possible visually. A steel nail should not scratch quartz/chalcedony, whereas limestone is readily scratched.

Field identification & locations

Common possibilities include quartz/chalcedony, milky quartz, limestone, or polished ceramic-like material. The reported Colombian location is compatible with quartz-bearing river gravels and sedimentary pebbles; test hardness and acid reaction for separation.