mineral

Brown chalcedony (likely carnelian/amber-like jasper)

Microcrystalline quartz, SiO₂; brown coloration commonly from iron oxides/hydroxides

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; translucent to opaque brown, resinous-to-waxy luster, cryptocrystalline structure, and no visible cleavage. The rounded, glossy surface suggests a naturally water-worn or polished piece.

Identified September 15, 2026More mineral →

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At a glance

Common name: Brown chalcedony (likely carnelian/amber-like jasper)
Scientific name: Microcrystalline quartz, SiO₂; brown coloration commonly from iron oxides/hydroxides
Category: mineral
Identified: September 15, 2026
Method: Standard

AI Estimated Value

Approximately $1–$10 for a small common rough piece; $10–$40 if unusually translucent, patterned, or cut. A firm identification would require testing for hardness, streak, density, and possibly UV response.

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

Forms when silica-rich groundwater fills cavities and fractures, later incorporating iron staining; it may occur in volcanic rocks, gravels, and sedimentary environments. Exact age cannot be determined from the photograph.

Uses & applications

Used as decorative stone, cabochons, beads, and small carvings; attractive specimens are collected, though this piece appears common and modestly valuable.

Geological facts

Its appearance can resemble amber, brown jasper, or weathered glass. Unlike amber, chalcedony is substantially harder and usually feels cool and stone-like rather than lightweight or warm.

Field identification & locations

Look for a waxy luster, conchoidal fracture, translucency at thin edges, and resistance to scratching by steel; quartz should not be scratched by a steel knife. Common sources include Brazil, Uruguay, India, Madagascar, Mexico, and the western United States.