mineral

Tumbled jasper (likely ocean or brecciated jasper)

Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide and other mineral inclusions

AI-generated identification · may be incorrect

Opaque, rounded and polished, with mottled tan, reddish-brown, gray, and cream colors; dull to waxy luster; hardness about 6.5–7 Mohs; no visible cleavage; cryptocrystalline structure; specific gravity roughly 2.55–2.70.

Identified August 22, 2026More mineral →

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At a glance

Common name: Tumbled jasper (likely ocean or brecciated jasper)
Scientific name: Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide and other mineral inclusions
Category: mineral
Identified: August 22, 2026
Method: Standard

AI Estimated Value

About $2–$15 for a common tumbled piece; $20–$100 or more for unusually patterned, large, or locality-labeled material.

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

Jasper forms when silica-rich groundwater replaces or cements volcanic ash, sediments, or breccia, with iron oxides producing red and brown colors. The specimen has been mechanically tumbled and polished; its precise geological age and locality cannot be determined from the image.

Uses & applications

Used for cabochons, beads, carvings, ornamental objects, and lapidary collections; generally unsuitable as a major construction stone because pieces are small.

Geological facts

Jasper is a variety of opaque chalcedony and may contain hematite, goethite, clay minerals, or volcanic fragments. Its patterns arise from impurities and replacement textures rather than large visible crystals.

Field identification & locations

Identify it by its opaque appearance, glassy-to-waxy polish, conchoidal fracture if broken, and resistance to scratching by a steel blade. Common sources include India, Madagascar, Brazil, Australia, Mexico, and the western United States.