sedimentary

Polished brecciated jasper (likely septarian or iron-rich jasper)

Microcrystalline quartz (chalcedony), SiO₂, with iron oxides and possibly calcite or other rock fragments

AI-generated identification · may be incorrect

Typically Mohs hardness 6.5–7 for the jasper matrix; opaque, dark brown to black with rusty yellow-brown patches and a glassy-to-waxy polish. Massive cryptocrystalline quartz lacks visible cleavage; specific gravity is about 2.5–2.7.

Identified August 8, 2026More sedimentary →

Explore Polished brecciated jasper (likely septarian or iron-rich 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 brecciated jasper (likely septarian or iron-rich jasper)
Scientific name: Microcrystalline quartz (chalcedony), SiO₂, with iron oxides and possibly calcite or other rock fragments
Category: sedimentary
Identified: August 8, 2026
Method: Standard

AI Estimated Value

Approximately $3–$15 for a small tumbled specimen; $20–$75 for larger, attractive polished pieces.

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 fluids cement fine sediment or breccia fragments, with iron producing the brown coloration; some varieties develop from altered volcanic or sedimentary material. Formation ages vary widely, commonly from Paleozoic to Cenozoic deposits.

Uses & applications

Used as a decorative stone, cabochon, tumbled stone, paperweight, and inexpensive jewelry material; polished pieces are primarily valued for appearance.

Geological facts

Jasper is an opaque variety of chalcedony, and its patterns commonly reflect mineral staining, brecciation, or replacement rather than large crystals.

Field identification & locations

Identify it by its opaque body, fine-grained texture, strong polish, and inability to scratch with a steel knife; quartz will scratch glass, though this test can damage the specimen. Common sources include Brazil, Madagascar, India, Mexico, and the western United States.