mineral

Tumbled tree agate (green-and-white chalcedony)

Cryptocrystalline quartz, SiO₂; commonly called tree agate, though the green inclusions are often chlorite or related minerals

AI-generated identification · may be incorrect

Polished, opaque white to pale-green mottling; vitreous to waxy luster and no visible cleavage. Quartz hardness is about 7 Mohs; the stone’s exact crystal structure and density depend on its inclusions.

Identified September 30, 2026More mineral →

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At a glance

Common name: Tumbled tree agate (green-and-white chalcedony)
Scientific name: Cryptocrystalline quartz, SiO₂; commonly called tree agate, though the green inclusions are often chlorite or related minerals
Category: mineral
Identified: September 30, 2026
Method: Standard

AI Estimated Value

Typically about $2–$15 USD for a small tumbled stone; size, polish, and pattern affect price.

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 fluids deposited chalcedony in rock cavities or fractures, with green mineral inclusions creating the branching or mossy patterns. The rough was later cut and tumbled; the image does not establish its geological age or source.

Uses & applications

Primarily sold as a pocket stone, lapidary material, or inexpensive jewelry and craft stone.

Geological facts

“Tree agate” is a trade name for patterned chalcedony, not a distinct mineral species. Similar-looking stones may be marketed as moss agate.

Field identification & locations

The rounded, glossy surface indicates a tumbled specimen; its cloudy green-and-white pattern is consistent with tree agate. Similar material occurs in several silica-bearing deposits worldwide, but appearance alone cannot identify its locality.