gemstone

Tumbled jasper, likely brecciated or brown-green jasper

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

AI-generated identification · may be incorrect

Opaque, reddish-brown to olive-green, with a waxy to dull luster and faint mottling; hardness about 6.5–7 Mohs, no visible cleavage, cryptocrystalline structure, and specific gravity near 2.6. The rounded shape and glossy surface indicate mechanical tumbling/polishing.

Identified September 11, 2026More gemstone →

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At a glance

Common name: Tumbled jasper, likely brecciated or brown-green jasper
Scientific name: Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide and other mineral impurities
Category: gemstone
Identified: September 11, 2026
Method: Standard

AI Estimated Value

Approximately $2–$15 for a polished piece of this size; unusual patterns or documented provenance may raise value to $20–$50.

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 fluids replace or cement volcanic ash, sediments, or altered rock, commonly incorporating iron oxides that produce red-brown colors; individual pieces may range from Paleozoic to Cenozoic in age. It occurs in volcanic terrains, hydrothermal zones, and sedimentary formations worldwide.

Uses & applications

Used for cabochons, beads, carvings, tumblestones, and decorative objects; opaque jasper is generally a low-cost ornamental gemstone rather than fine jewelry material.

Geological facts

Jasper is a variety of chalcedony distinguished by abundant inclusions and opacity; color patterns can resemble landscapes, foliage, or breccia.

Field identification & locations

Identify it by its opaque appearance, silica-like hardness, smooth waxy polish, and inability to scratch with a steel knife easily; common sources include India, Madagascar, Brazil, Australia, and the western United States.