sedimentary

Brecciated quartz-rich rock, possibly silicified breccia

Silica-rich breccia; chiefly microcrystalline quartz (SiO₂), with possible calcite and iron-oxide staining

AI-generated identification · may be incorrect

Hardness about 6.5–7 for quartz, with white, gray, tan, and rusty-brown angular fragments; vitreous to dull luster, irregular fracture, and no obvious cleavage. The coarse angular clasts cemented by pale silica suggest brecciation and later silicification.

Identified August 12, 2026More sedimentary →

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At a glance

Common name: Brecciated quartz-rich rock, possibly silicified breccia
Scientific name: Silica-rich breccia; chiefly microcrystalline quartz (SiO₂), with possible calcite and iron-oxide staining
Category: sedimentary
Identified: August 12, 2026
Method: Standard

AI Estimated Value

About $5–$30 for a hand-sized common specimen; $30–$100+ if vividly colored, mineralized, or polished.

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 fragments were cemented by silica-bearing hydrothermal fluids or groundwater; exact age and source cannot be determined from the image. Such material commonly occurs in fault zones, volcanic districts, and mineralized veins.

Uses & applications

Used mainly as a collecting specimen, lapidary rough, or decorative stone; attractive pieces may polish well, though abundant fractures reduce cutting value.

Geological facts

The angular clasts distinguish breccia from conglomerate, whose clasts are rounded. Blue-gray coloration may reflect chalcedony, altered volcanic rock, or minor copper-bearing minerals, but chemical testing is needed.

Field identification & locations

Look for angular fragments, quartz-like hardness, conchoidal fracture, and possible reaction to dilute acid if calcite is present; a streak, hardness test, magnification, and specific-gravity test would improve identification. Common in hydrothermal vein and fault-zone deposits worldwide.