mineral

Likely brown quartz-rich rock or iron-stained mineral specimen

Indeterminate; possibly iron-stained quartz (SiO₂) with limonite/goethite coatings

AI-generated identification · may be incorrect

Dark reddish-brown, irregular and partly glossy surface with pale crystalline patches; quartz hardness ~7, vitreous luster, no obvious cleavage, and specific gravity ~2.65. The image is blurred, so crystal form and exact composition cannot be confirmed.

Identified August 14, 2026More mineral →

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At a glance

Common name: Likely brown quartz-rich rock or iron-stained mineral specimen
Scientific name: Indeterminate; possibly iron-stained quartz (SiO₂) with limonite/goethite coatings
Category: mineral
Identified: August 14, 2026
Method: Standard

AI Estimated Value

About $5–$30 as an unidentified common specimen; potentially $30–$100 if confirmed as attractive, well-crystallized quartz.

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

May have formed when silica-bearing fluids deposited quartz in a fracture, followed by oxidation of iron minerals producing brown limonite/goethite staining. Such specimens commonly form in hydrothermal veins and weathered zones, generally over millions of years.

Uses & applications

Quartz-rich material is used for glass, abrasives, and construction aggregate; attractive pieces may be collected or used decoratively, though this specimen appears of modest lapidary value.

Geological facts

Iron oxides commonly create red-brown coatings and can obscure quartz, sulfides, or other minerals beneath. A fresh white streak or visible glassy conchoidal fracture would support quartz identification.

Field identification & locations

Common in hydrothermal veins and oxidized ore deposits worldwide. Test a clean edge with a steel file and inspect with magnification; definitive identification requires streak, hardness, density, and possibly chemical or X-ray testing.