mineral

Weathered quartz-rich rock, possibly agate or chalcedony

Silica (SiO₂), likely microcrystalline quartz (chalcedony); identification is uncertain from the image

AI-generated identification · may be incorrect

Yellow-brown, rough exterior with a pale gray, somewhat translucent-looking edge; quartz has Mohs hardness 7, vitreous to waxy luster, and no cleavage. The visible texture is consistent with silica, but the specimen cannot be identified confidently from one view.

Identified October 8, 2026More mineral →

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At a glance

Common name: Weathered quartz-rich rock, possibly agate or chalcedony
Scientific name: Silica (SiO₂), likely microcrystalline quartz (chalcedony); identification is uncertain from the image
Category: mineral
Identified: October 8, 2026
Method: Standard

AI Estimated Value

Approximately $1-$10 for a small, common rough specimen; value depends on confirmed identity, pattern, and quality.

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

Silica may precipitate from mineral-rich water in rock cavities and later weather at the surface; no age or specific formation environment can be determined from the image.

Uses & applications

If confirmed as agate or chalcedony, it may be cut and polished for jewelry or collected as a specimen; this rough piece appears to have modest decorative value.

Geological facts

Iron-oxide staining commonly gives silica-rich rocks yellow or brown coloration.

Field identification & locations

Look for translucent edges, waxy luster, hardness near 7, and conchoidal fracture; a scratch test or fresh cut surface would help distinguish chalcedony from other rocks. Similar material occurs worldwide in volcanic cavities and sedimentary settings.