mineral

Weathered quartz-bearing rock fragment

Indeterminate; likely quartz-rich granite or silicified host rock with iron-oxide staining

AI-generated identification · may be incorrect

Tan-brown, irregular, granular specimen with pale translucent grains and rusty surface coating; likely hardness about 6–7 Mohs, vitreous to dull luster, no obvious cleavage, and moderate specific gravity around 2.6–2.8.

Identified August 13, 2026More mineral →

Explore Weathered quartz-bearing rock fragment in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

At a glance

Common name: Weathered quartz-bearing rock fragment
Scientific name: Indeterminate; likely quartz-rich granite or silicified host rock with iron-oxide staining
Category: mineral
Identified: August 13, 2026
Method: Standard

AI Estimated Value

Typically $0–$5 as an unidentified common fragment; substantially more only if testing reveals a distinctive mineral, ore, fossil, or meteorite.

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 naturally weathered fragment of quartz-rich igneous or hydrothermal rock; its exact geological age and formation environment cannot be determined from the photograph.

Uses & applications

Primarily a casual geological specimen or teaching sample; no significant industrial or jewelry use is apparent at this size and quality.

Geological facts

The rusty coloration commonly results from oxidation of iron-bearing minerals into limonite or goethite. A glassy grain that scratches ordinary glass would support quartz identification.

Field identification & locations

Commonly encountered in weathered outcrops, gravel, and stream deposits worldwide; inspect a fresh broken surface and test hardness, streak, magnetism, and acid reaction for better identification.