mineral

Small tumbled stone, possibly moss agate

Likely chalcedony (microcrystalline SiO₂); exact identification is uncertain from the image

AI-generated identification · may be incorrect

Rounded, translucent-to-opaque brownish gray stone with mottled inclusions and a subdued polish. If chalcedony, hardness is about 6.5–7 Mohs, with a waxy to vitreous luster and no visible cleavage.

Identified September 29, 2026More mineral →

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Physical properties

Rounded, translucent-to-opaque brownish gray stone with mottled inclusions and a subdued polish. If chalcedony, hardness is about 6.5–7 Mohs, with a waxy to vitreous luster and no visible cleavage.

Formation & geological history

The appearance is consistent with silica-rich chalcedony formed in cavities or fractures as silica-bearing fluids deposit and crystallize; the stone has been shaped by tumbling. Geological age and source cannot be determined from the photo.

Uses & applications

Tumbled stones are used for collecting, décor, and jewelry; chalcedony is also used for beads and carvings.

Geological facts

Moss agate is chalcedony with branching mineral inclusions—not actual moss—but the pictured specimen is too small and unclear to confirm that variety.

Field identification & locations

Look for hardness sufficient to resist a steel-knife scratch, a smooth waxy surface, and translucent edges; avoid relying on color alone. Similar tumbled stones are sold worldwide.