mineral

Orange chalcedony / quartz-rich cobble

Microcrystalline quartz (SiO₂), likely iron-oxide-stained chalcedony; exact identification requires testing

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; orange-brown, opaque to weakly translucent, with dull to waxy luster and no obvious cleavage. The rounded form suggests a naturally weathered or tumbled specimen; color likely comes from hematite or goethite inclusions.

Identified September 1, 2026More mineral →

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At a glance

Common name: Orange chalcedony / quartz-rich cobble
Scientific name: Microcrystalline quartz (SiO₂), likely iron-oxide-stained chalcedony; exact identification requires testing
Category: mineral
Identified: September 1, 2026
Method: Standard

AI Estimated Value

Approximately $2–$15 as a small common cobble; $20–$75 if confirmed high-quality orange chalcedony or jasper with attractive patterning.

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-rich groundwater deposited microcrystalline quartz in cavities or fractures, followed by iron staining and abrasion; commonly Cenozoic or older, depending on source rock. It may also be a polished/tumbled jasper-like quartz specimen.

Uses & applications

Used as a lapidary material for cabochons, carvings, beads, and decorative stones; attractive pieces are collected, but this example appears common-grade.

Geological facts

A steel file or quartz crystal should not easily scratch it, while glass can be scratched by it. Strong orange-red streaking or magnetic response would indicate abundant iron oxides.

Field identification & locations

Common in weathered volcanic terrains, hydrothermal veins, river gravels, and jasper deposits worldwide, including Brazil, India, Madagascar, and the western United States. Confirm with hardness, translucency, and a fresh break; avoid destructive tests on valuable pieces.