mineral

Weathered quartz-rich rock fragment

Likely quartz-bearing vein rock, possibly quartzite or silicified breccia; exact identification requires testing

AI-generated identification · may be incorrect

Pale gray to tan, translucent edges, vitreous to dull luster, irregular fracture, and no obvious cleavage; quartz hardness is about 7 Mohs, while the brown coating may be iron oxides or weathering products.

Identified September 6, 2026More mineral →

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At a glance

Common name: Weathered quartz-rich rock fragment
Scientific name: Likely quartz-bearing vein rock, possibly quartzite or silicified breccia; exact identification requires testing
Category: mineral
Identified: September 6, 2026
Method: Standard

AI Estimated Value

Typically $0-$5 as an ordinary fragment; perhaps $5-$20 if unusually attractive, locality-labeled, or demonstrably mineralized.

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

Probably formed when silica-rich fluids filled fractures and later weathered at or near the surface; its age cannot be determined from the photograph and depends on the host geology.

Uses & applications

Common quartz-rich fragments have little commercial value individually, though quartz is important in glass, ceramics, electronics, and construction aggregate; this piece is mainly a field specimen.

Geological facts

The rusty brown coloration commonly reflects limonite/goethite staining, while the dark seams may be manganese oxides, clay, or inclusions. A steel nail should not scratch fresh quartz, but quartz can scratch glass.

Field identification & locations

Look for abundant quartz, conchoidal or irregular fracture, and hardness near 7; vinegar will not fizz unless carbonate minerals are present. Common in hydrothermal veins, stream gravels, and weathered bedrock worldwide.