mineral

Quartz-rich breccia or iron-stained quartz vein

Microcrystalline and crystalline quartz (SiO₂) with iron-oxide minerals, possibly limonite/goethite and sulfides

AI-generated identification · may be incorrect

Brown, gray, and cream irregular fragments show a glassy to dull luster and apparent massive, fractured texture; quartz hardness is 7 Mohs, with no cleavage and conchoidal fracture. The metallic-looking patches may be iron oxides or weathered sulfides, but the image is insufficient for confident mineral identification.

Identified August 22, 2026More mineral →

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At a glance

Common name: Quartz-rich breccia or iron-stained quartz vein
Scientific name: Microcrystalline and crystalline quartz (SiO₂) with iron-oxide minerals, possibly limonite/goethite and sulfides
Category: mineral
Identified: August 22, 2026
Method: Standard

AI Estimated Value

About $5–$30 for a common hand specimen; $30–$100+ if unusually attractive, mineral-rich, or locality-documented.

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 and cemented fractures, with later oxidation producing the brown coloration. The exact age depends on its host deposit and cannot be determined visually.

Uses & applications

Typical specimens are collected as display rocks or lapidary rough; quartz-rich material may be crushed for aggregate or silica, while attractive pieces can be polished. It is generally not gem-grade based on the visible texture.

Geological facts

Iron staining commonly produces yellow-brown to reddish colors through limonite and goethite. A streak, hardness, magnetism, and acid test would help distinguish quartz vein material from sulfide-bearing ore or slag.

Field identification & locations

Common in hydrothermal veins and mineralized zones worldwide, including areas of the western United States, Brazil, Australia, and Europe. Test whether clear grains scratch glass; avoid assuming metallic patches are gold without assay.