mineral

Weathered quartz-rich mineral nodule

Likely quartz (SiO₂) with iron-oxide staining and possibly feldspar/mica; exact identification requires testing

AI-generated identification · may be incorrect

Small rounded specimen with pale blue-gray translucent areas, rusty brown coating, and a dull to vitreous luster. Quartz hardness is Mohs 7, lacks cleavage, and has a hexagonal crystal structure; apparent hardness and composition are uncertain from the image.

Identified August 23, 2026More mineral →

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At a glance

Common name: Weathered quartz-rich mineral nodule
Scientific name: Likely quartz (SiO₂) with iron-oxide staining and possibly feldspar/mica; exact identification requires testing
Category: mineral
Identified: August 23, 2026
Method: Standard

AI Estimated Value

Typically $1-$10 as an unidentified common specimen; up to $20-$50 if confirmed as attractive blue chalcedony or another collectible mineral.

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 quartz vein fragment or silicified nodule, with iron oxidation producing the brown surface. Such material commonly forms in hydrothermal veins and weathered igneous or metamorphic terrains; age depends on its host geology.

Uses & applications

Primarily a collector specimen or curiosity; quartz-rich material may be used industrially for glass and silica products, but this small piece has no practical commercial use.

Geological facts

The blue color may reflect chalcedony, microscopic inclusions, or surface reflection rather than a distinct blue mineral. A streak, hardness, and acid test would substantially improve identification.

Field identification & locations

Common in quartz-vein districts worldwide, including the western United States, Brazil, Madagascar, and Australia. Scratch-testing glass and examining translucency can support quartz identification; avoid damaging potentially valuable material.