mineral

Tumbled chalcedony pebble, possibly carnelian or jasper

Microcrystalline quartz (SiO₂), likely iron-stained chalcedony/jasper

AI-generated identification · may be incorrect

Hardness 6.5–7 Mohs; pink-red to lavender coloration, waxy to dull luster, cryptocrystalline structure, no visible cleavage, and typically specific gravity about 2.6. The rounded shape and surface polish indicate tumbling or natural water wear; small pits may be vesicles or weathering cavities.

Identified August 29, 2026More mineral →

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At a glance

Common name: Tumbled chalcedony pebble, possibly carnelian or jasper
Scientific name: Microcrystalline quartz (SiO₂), likely iron-stained chalcedony/jasper
Category: mineral
Identified: August 29, 2026
Method: Standard

AI Estimated Value

$1–$10 for a small common tumbled pebble; approximately $10–$30 if naturally colored, unusually patterned, or confirmed as quality carnelian.

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

Silica-rich groundwater deposited microscopic quartz in cavities or fractures, with iron oxides producing the red color; such material commonly formed in volcanic rocks during the Cenozoic or older. Exact identification and age require testing or a fresh surface.

Uses & applications

Used for cabochons, beads, carvings, lapidary specimens, and decorative stone; jasper and chalcedony are also used as aggregate or architectural accents.

Geological facts

Carnelian is translucent orange-red chalcedony, whereas jasper is generally opaque and more impure. The specimen’s muted pink-purple appearance may also reflect dyed or coated material.

Field identification & locations

Check translucency at the edges, a glass-scratching hardness, and a waxy fracture; quartz will not react with dilute acid. Common sources include Brazil, India, Madagascar, Uruguay, and the western United States.