mineral

Quartz-rich breccia or silicified rock with metallic sulfide mineralization

Microcrystalline and crystalline SiO₂, likely quartz/chalcedony, with possible pyrite or other sulfides

AI-generated identification · may be incorrect

Hardness about 6.5–7 for the pale matrix; vitreous to waxy luster, gray, cream, and tan coloring, irregular massive texture, and no obvious cleavage. The brassy metallic patches may be pyrite, but image-only identification is uncertain.

Identified September 11, 2026More mineral →

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At a glance

Common name: Quartz-rich breccia or silicified rock with metallic sulfide mineralization
Scientific name: Microcrystalline and crystalline SiO₂, likely quartz/chalcedony, with possible pyrite or other sulfides
Category: mineral
Identified: September 11, 2026
Method: Standard

AI Estimated Value

About $5–$30 for a common hand specimen; roughly $50–$150 if the metallic mineralization, polish, or locality is especially attractive.

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 silica-rich hydrothermal fluids filled fractures or cemented brecciated rock; sulfides crystallized during the same mineralizing event. Precise geological age and host locality cannot be determined from the photograph.

Uses & applications

Used mainly as a collector specimen or lapidary material; quartz-rich portions may polish attractively. It has little commercial value unless the metallic mineralization or patterns are unusually attractive.

Geological facts

A steel file should scratch the matrix only with difficulty, while a copper coin will not scratch quartz. Pyrite is brassy, opaque, and brittle; gold is softer, more malleable, and leaves a yellow streak.

Field identification & locations

Look for conchoidal fracture, hardness near 7, and acid resistance; a streak test and specific-gravity or X-ray analysis can distinguish quartz from calcite and identify the sulfide. Similar material occurs in hydrothermal veins and mineralized breccias worldwide.