mineral

Polished brown jasper (likely orbicular or brecciated jasper)

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

AI-generated identification · may be incorrect

Opaque, dark brown to olive-brown with diffuse golden orbicular patches and a glassy-to-waxy polish; quartz hardness is about 6.5–7 Mohs, with no visible cleavage and conchoidal fracture. Specific gravity is typically 2.55–2.70.

Identified August 28, 2026More mineral →

Explore Polished brown jasper (likely orbicular or brecciated jasper) in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

At a glance

Common name: Polished brown jasper (likely orbicular or brecciated jasper)
Scientific name: Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide and other accessory inclusions
Category: mineral
Identified: August 28, 2026
Method: Standard

AI Estimated Value

About $5–$30 for a palm-sized polished stone; unusually vivid patterns or documented localities may bring $40–$100+.

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

Forms when silica-rich groundwater fills cavities or replaces volcanic and sedimentary material, while iron oxides create the brown coloration and patterns. The specimen’s exact geological age and locality cannot be determined from the image.

Uses & applications

Used for cabochons, beads, carvings, worry stones, and decorative objects; large jasper blocks are also used ornamentally. Common polished pieces generally have modest collector value.

Geological facts

Jasper is an opaque variety of chalcedony rather than a single mineral species; its patterns commonly result from repeated silica deposition, brecciation, or orbicular growth.

Field identification & locations

Identify it by its opacity, fine-grained texture, earthy patterning, lack of cleavage, and ability to scratch glass; distinguish it from brown agate, which is usually translucent and banded. Common sources include India, Madagascar, Brazil, Mexico, Australia, and the western United States.