metamorphic

Brecciated jasper (polished/cut rough specimen)

Silica-rich microcrystalline quartz aggregate, chiefly SiO₂, with iron-oxide pigments; brecciated jasper

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; opaque, multicolored red, yellow, brown, cream, and gray; vitreous to dull/waxy luster. It consists of angular silica-rich fragments cemented by chalcedony or quartz, with irregular cavities and no prominent cleavage.

Identified September 7, 2026More metamorphic →

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At a glance

Common name: Brecciated jasper (polished/cut rough specimen)
Scientific name: Silica-rich microcrystalline quartz aggregate, chiefly SiO₂, with iron-oxide pigments; brecciated jasper
Category: metamorphic
Identified: September 7, 2026
Method: Standard

AI Estimated Value

Approximately $10–$60 as a rough specimen of this size; $50–$200 or more if exceptionally colorful, polished, and from a desirable locality.

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 rock or volcanic material is fractured and later cemented by silica-bearing fluids, commonly with hematite/goethite staining. Usually Cenozoic to older, depending on the deposit; precise age requires locality data.

Uses & applications

Used for cabochons, carvings, beads, ornamental slabs, and lapidary collections; occasionally as decorative stone. Its value is primarily aesthetic rather than industrial.

Geological facts

The striking colors commonly reflect iron oxides and hydroxides, while cream or translucent areas are chalcedony or quartz. Brecciation produces the angular “jigsaw” pattern characteristic of brecciated jasper.

Field identification & locations

Identify it by its opaque multicolor pattern, angular fragments, silica hardness, and lack of acid reaction; a steel file generally does not scratch it. Common sources include Oregon, Utah, Arizona, Mexico, Madagascar, and Australia.