metamorphic

Brecciated jasper/quartz-rich polymictic rock

Silicified breccia, chiefly microcrystalline quartz (SiO₂) with iron-oxide and sulfide staining

AI-generated identification · may be incorrect

Hardness about 6.5–7; mottled pink, gray, cream, black, and rusty brown; generally dull to waxy luster with occasional sparkly quartz or sulfide grains. It appears massive and non-cleavable, with angular clasts in a silica-rich matrix; exact identification requires testing.

Identified September 15, 2026More metamorphic →

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At a glance

Common name: Brecciated jasper/quartz-rich polymictic rock
Scientific name: Silicified breccia, chiefly microcrystalline quartz (SiO₂) with iron-oxide and sulfide staining
Category: metamorphic
Identified: September 15, 2026
Method: Standard

AI Estimated Value

About $5–$30 as a rough specimen; $20–$100+ if attractively polished, patterned, or confirmed to contain collectible minerals.

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

Likely formed when fractured rock was cemented and silicified by silica-bearing hydrothermal fluids, with later iron staining; age cannot be determined from the photograph. Such material commonly occurs in volcanic-hosted hydrothermal veins and fault zones.

Uses & applications

Used as an ornamental and lapidary stone for cabochons, polished slabs, carvings, and decorative aggregate; usually not a major construction stone.

Geological facts

The black and metallic-looking areas may be manganese/iron oxides or sulfide minerals rather than gold. A streak, hardness, acid, and specific-gravity test would distinguish jasper from altered ore or metamorphic breccia.

Field identification & locations

Look for angular multicolored fragments, very fine quartz texture, conchoidal fracture, and no reaction to dilute hydrochloric acid. Common settings include hydrothermal districts worldwide; avoid assuming metallic grains are precious metal without assay.