mineral

Likely banded agate pebble

Microcrystalline quartz (SiO₂), typically chalcedony; identification is uncertain from the image

AI-generated identification · may be incorrect

Gray-blue and white, waxy to slightly glossy surface with curved banding; quartz has Mohs hardness 7 and trigonal crystal structure, though its microcrystals are too small to see. Specific gravity is about 2.6; cleavage is absent and fracture is typically conchoidal.

Identified October 11, 2026More mineral →

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Physical properties

Formation & geological history

Agate forms as silica-rich fluids fill cavities in volcanic rock and deposit chalcedony in successive bands. Its age depends on the host rock and cannot be determined from the photograph.

Uses & applications

Used for jewelry, ornaments, carvings, and polished collectibles; agate is also used in small precision components.

Geological facts

The rounded, smooth form suggests water-worn or polished material, but the wet surface makes its color and texture harder to assess.

Field identification & locations

Look for distinct internal bands and a glassy-to-waxy luster; common sources include volcanic regions and river or beach gravels. A closer view or hardness test would help confirm the identification.