mineral

Small polished jasper or agate pebble

Likely microcrystalline quartz (SiO₂); exact variety cannot be determined from the photo

AI-generated identification · may be incorrect

Opaque cream, mustard-yellow, and brown patching with a polished, waxy-to-vitreous surface; quartz hardness 6.5–7, trigonal crystal structure, no visible cleavage, specific gravity about 2.6. The specimen is too small and the image too limited to confirm its identity or measure properties.

Identified October 7, 2026More mineral →

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Physical properties

Formation & geological history

If jasper or agate, it formed as silica-rich fluids filled cavities or fractures and later hardened; such deposits occur in many geological ages and settings.

Uses & applications

Small polished pieces are commonly used for jewelry, crafts, and collecting; this fragment is likely decorative rather than industrially useful.

Geological facts

Jasper and agate are chalcedony varieties—microcrystalline quartz—and colored bands or patches commonly reflect impurities and changing silica deposition.

Field identification & locations

Look for a very hard, fine-grained surface and, in agate, translucency or distinct banding; the photographed piece is opaque and could also be another stone or composite. Similar material is found worldwide, including Brazil, India, and the western United States.