mineral

Tumbled honey-brown chalcedony (likely common quartz)

Microcrystalline quartz, SiO₂; possibly iron-stained chalcedony or low-grade agate

AI-generated identification · may be incorrect

Translucent gray-brown to honey-brown, waxy-to-glassy luster, rounded by tumbling, and lacking visible cleavage; Mohs hardness about 6.5–7, with specific gravity near 2.6. Internal cloudy zones and fine fractures are consistent with chalcedony or quartz-rich material.

Identified September 19, 2026More mineral →

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At a glance

Common name: Tumbled honey-brown chalcedony (likely common quartz)
Scientific name: Microcrystalline quartz, SiO₂; possibly iron-stained chalcedony or low-grade agate
Category: mineral
Identified: September 19, 2026
Method: Standard

AI Estimated Value

About $3–$20 for a palm-sized commercial tumbled piece; $20–$75 if unusually translucent, patterned, or sold as quality agate/chalcedony.

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 microscopic quartz fibers in cavities or fractures, with iron oxides producing the brown color; the specimen was subsequently cut or naturally broken and mechanically tumbled. The exact geological age cannot be determined visually and depends on its source deposit.

Uses & applications

Used as an inexpensive lapidary stone for cabochons, carvings, beads, and polished specimens; generally has modest jewelry and collecting value.

Geological facts

Chalcedony is quartz with crystals too small to see individually; translucent varieties may be marketed as honey chalcedony, brown agate, or jasper depending on opacity and banding.

Field identification & locations

Test cautiously for glassy quartz hardness: it should scratch ordinary glass but not be scratched by a steel knife; a streak test is usually white. Common sources include Brazil, Uruguay, India, Madagascar, Mexico, and the western United States.