mineral

Polished jasper pebble

Jasper, an opaque microcrystalline variety of quartz (SiO₂), with possible iron-oxide and other mineral inclusions

AI-generated identification · may be incorrect

Brown, tan, and cream mottling; smooth, polished surface and waxy-to-dull luster. Quartz hardness is about 7 Mohs; microcrystalline structure, with no visible cleavage. The image does not allow a definitive identification or specific-gravity estimate.

Identified September 29, 2026More mineral →

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Physical properties

Formation & geological history

Jasper forms as silica-rich material fills or replaces rock, often colored by iron oxides. Its age and exact formation environment cannot be determined from the photograph.

Uses & applications

Commonly made into beads, cabochons, and decorative objects; also collected as a polished stone.

Geological facts

Jasper is a broad trade name for many patterned, opaque chalcedonies; appearance alone cannot establish a specific variety.

Field identification & locations

Look for an opaque, finely patterned stone that resists scratching; confirm with hardness and other tests, since several rocks can look similar. Jasper occurs worldwide in silica-rich deposits.