mineral

Weathered quartz-rich rock fragment

Likely milky quartz–bearing quartzite or silica-rich chert; exact identification requires testing

AI-generated identification · may be incorrect

Tan-brown, opaque to weakly translucent, with a dull to slightly vitreous luster and irregular fracture; apparent hardness about 6–7 Mohs, but grain size and cleavage are not resolvable from the image.

Identified September 16, 2026More mineral →

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At a glance

Common name: Weathered quartz-rich rock fragment
Scientific name: Likely milky quartz–bearing quartzite or silica-rich chert; exact identification requires testing
Category: mineral
Identified: September 16, 2026
Method: Standard

AI Estimated Value

Generally under $1 for an ordinary fragment; approximately $5–$20 for an attractive labeled specimen, with substantially higher prices only for unusual or polished material.

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 a natural siliceous fragment formed by cementation or metamorphism of quartz-rich sediment, later weathered and iron-stained; its geological age cannot be determined visually.

Uses & applications

Common material has little commercial value; quartzite may be used as aggregate, building stone, or decorative material, while attractive pieces can be collected.

Geological facts

The brown coloration is consistent with iron-oxide staining along fractures or grain boundaries. A glassy edge and lack of obvious cleavage favor quartz over feldspar or mica.

Field identification & locations

Look for abundant quartz grains, no cleavage, and the ability to scratch ordinary glass; quartzite typically shows fused grains, whereas chert is smoother and microcrystalline. Common worldwide, especially in quartz-rich sedimentary and metamorphic terrains.