mineral

Botryoidal chalcedony (agate/jasper), likely iron-stained

Microcrystalline quartz, SiO₂; chalcedony with possible jasper and goethite/hematite inclusions

AI-generated identification · may be incorrect

Typically hardness 6.5–7, vitreous to waxy luster, translucent gray-brown to orange-red color, and no cleavage; the specimen shows cryptocrystalline, layered/botryoidal quartz with rusty iron-oxide staining.

Identified September 16, 2026More mineral →

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At a glance

Common name: Botryoidal chalcedony (agate/jasper), likely iron-stained
Scientific name: Microcrystalline quartz, SiO₂; chalcedony with possible jasper and goethite/hematite inclusions
Category: mineral
Identified: September 16, 2026
Method: Standard

AI Estimated Value

Approximately $5–$30 as a small rough specimen; $20–$100+ if the pattern, translucency, or polished finish is especially attractive.

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, depositing chalcedony in successive layers; iron oxides create the brown, orange, and red colors. Its precise geological age cannot be determined from the image.

Uses & applications

Used as ornamental stone, cabochons, beads, carvings, and lapidary material; less colorful pieces are mainly collector specimens.

Geological facts

Chalcedony is quartz whose crystals are too small to see unaided. Agate is commonly banded, while jasper is more opaque and impurity-rich; this piece appears transitional between them.

Field identification & locations

Look for waxy luster, conchoidal fracture, translucency at thin edges, and hardness sufficient to scratch glass. Common sources include volcanic terrains in Brazil, Uruguay, Mexico, India, and the western United States.