gemstone

Polished moss agate cabochon

Moss agate, a translucent chalcedony variety (microcrystalline quartz, SiO₂) with inclusions of chlorite, amphibole, or manganese/iron oxides

AI-generated identification · may be incorrect

Mohs hardness 6.5–7; pale gray-green to whitish body with branching moss-like inclusions, vitreous to waxy luster, no visible cleavage, cryptocrystalline quartz structure, and specific gravity about 2.60. The pictured piece is polished and cabochon-shaped.

Identified August 24, 2026More gemstone →

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At a glance

Common name: Polished moss agate cabochon
Scientific name: Moss agate, a translucent chalcedony variety (microcrystalline quartz, SiO₂) with inclusions of chlorite, amphibole, or manganese/iron oxides
Category: gemstone
Identified: August 24, 2026
Method: Standard

AI Estimated Value

Approximately $5–$25 for a small polished cabochon; $30–$100+ for exceptional patterning or larger, well-finished pieces.

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 or fractures in volcanic rocks, with mineral inclusions producing the dendritic patterns; deposits are commonly Cenozoic to older, depending on locality. It is found worldwide, notably in India, Brazil, Uruguay, the United States, and Australia.

Uses & applications

Used for cabochons, beads, carvings, and ornamental objects; attractive patterning can make it desirable in handmade jewelry and mineral collections.

Geological facts

Despite its name, moss agate is not biological and is not true banded agate; its green “moss” consists of mineral inclusions. Patterns are often unique and may resemble landscapes or vegetation.

Field identification & locations

Identify it by translucency, hardness, glassy polish, and internal branching inclusions; it should resist scratching by a steel blade. Common commercial material is inexpensive; unusually vivid, balanced patterns command higher prices.