mineral

Polished agate with possible iron-oxide inclusions

Microcrystalline quartz (chalcedony), SiO₂; inclusions appear to be iron oxides, possibly goethite or hematite

AI-generated identification · may be incorrect

Translucent gray-blue chalcedony with rusty-brown branching inclusions; vitreous to waxy luster, Mohs hardness 6.5–7, trigonal quartz structure. The small polished specimen shows no obvious cleavage; identification of the inclusions is uncertain from the image.

Identified October 10, 2026More mineral →

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At a glance

Common name: Polished agate with possible iron-oxide inclusions
Scientific name: Microcrystalline quartz (chalcedony), SiO₂; inclusions appear to be iron oxides, possibly goethite or hematite
Category: mineral
Identified: October 10, 2026
Method: Standard

AI Estimated Value

About $2–$20 for a small, common polished piece; exceptional patterns or verified provenance can raise the value.

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

Formed as silica-rich fluids filled cavities or fractures and deposited chalcedony, potentially trapping or growing iron oxides. Agates occur in rocks of many ages, commonly in volcanic cavities; the specimen’s precise age and locality cannot be determined visually.

Uses & applications

Used for jewelry, cabochons, carvings, and collecting; agate is also used for ornamental objects and historically for precision components.

Geological facts

Branching, plant-like mineral inclusions are often called dendrites, though they are mineral growths rather than fossils or plants.

Field identification & locations

Look for translucent chalcedony and natural-looking internal bands or inclusions; common sources include Brazil, Uruguay, India, and the United States. The image supports agate/chalcedony, but not a specific variety or locality.