mineral

Polished black-and-white pebble

Indeterminate; possibly banded agate/chalcedony or black-and-white jasper

AI-generated identification · may be incorrect

Dark gray to black, opaque-to-translucent stone with a distinct pale band and polished/worn surface; likely Mohs 6.5–7, vitreous to waxy luster, cryptocrystalline quartz, with no visible cleavage. Specific gravity is approximately 2.6.

Identified August 30, 2026More mineral →

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Physical properties

Formation & geological history

Likely silica-rich material formed by deposition of chalcedony or jasper in cavities or fractures, then naturally rounded or tumbled and polished. Exact geological age and locality cannot be determined from the photograph.

Uses & applications

Used as a decorative pebble, lapidary cabochon, or inexpensive jewelry/collecting specimen; not typically used structurally.

Geological facts

The sharp contrasting band may indicate agate-like chalcedony, while the opaque black portion could be jasper or another silica-rich inclusion.

Field identification & locations

Field identification requires a hardness test: it should scratch ordinary glass but not be scratched by a steel knife. Common possibilities occur worldwide, especially in volcanic terrains; a close-up, translucency test, streak, and locality are needed for confident identification.