mineral

Tumbled agate (likely moss agate)

Microcrystalline quartz, SiO₂; chalcedony variety, possibly moss agate

AI-generated identification · may be incorrect

Smooth, rounded, gray-green translucent stone with cloudy, moss-like inclusions and a waxy to vitreous luster. Quartz hardness is 6.5–7 Mohs; crystals are microscopic and it has no visible cleavage. The image alone cannot confirm the exact variety.

Identified October 3, 2026More mineral →

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Physical properties

Formation & geological history

Agate forms as silica-rich fluids fill cavities in volcanic rocks, depositing chalcedony in layers; inclusions may create moss-like patterns. Its age depends on the host rock and deposit.

Uses & applications

Tumbled stones are used for collecting, crafts, and jewelry; agate is also used for ornamental objects and, historically, precision components.

Geological facts

Agate’s bands and inclusions arise from variations in silica deposition and trace minerals. Tumbling smooths the surface and enhances its pattern.

Field identification & locations

Look for a hard, waxy-feeling stone with translucent edges and internal patterns; agate occurs worldwide, including Brazil, Uruguay, India, and the United States. A small tumbled piece like this commonly sells for about $1–$10 USD.