mineral

Tumbled orange chalcedony/agate (probable)

Microcrystalline quartz, SiO₂; likely iron-stained chalcedony with possible druzy quartz

AI-generated identification · may be incorrect

Typically Mohs hardness 6.5–7, vitreous to waxy luster, translucent orange-brown color, and no visible cleavage; the rough texture and pale sparkling areas may indicate quartz-lined cavities. Exact identification is limited by the photograph.

Identified September 3, 2026More mineral →

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At a glance

Common name: Tumbled orange chalcedony/agate (probable)
Scientific name: Microcrystalline quartz, SiO₂; likely iron-stained chalcedony with possible druzy quartz
Category: mineral
Identified: September 3, 2026
Method: Standard

AI Estimated Value

About $2–$15 for small rough or tumbled pieces; $15–$75 for attractive, well-polished specimens, with higher prices for strongly banded or exceptional material.

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 in volcanic rocks, later depositing chalcedony and quartz; iron oxides create the orange coloration. Formation can span millions of years, commonly in Cenozoic volcanic terrains.

Uses & applications

Used as ornamental stone, cabochons, beads, carvings, and polished collectibles; lower-grade pieces are inexpensive decorative material.

Geological facts

Orange chalcedony is often sold under broad trade names such as carnelian or orange agate, though true agate generally shows visible banding. A scratch test against glass can help confirm quartz hardness, but it may damage the specimen.

Field identification & locations

Common sources include Brazil, Uruguay, India, Madagascar, Mexico, and the western United States. Look for waxy translucence, conchoidal fracture, and absence of cleavage; the pictured pieces may also contain weathered host rock.