sedimentary

Polished/tumbled brown-and-white jasper

Microcrystalline quartz (SiO₂), commonly called jasper; likely brecciated or banded jasper

AI-generated identification · may be incorrect

Opaque brown, cream, and white bands with a waxy-to-glassy polish; fine-grained, no visible crystals or cleavage. Quartz hardness is about 6.5–7 Mohs; specific gravity roughly 2.6. The rounded shape indicates tumbling or water wear.

Identified September 8, 2026More sedimentary →

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Physical properties

Formation & geological history

Jasper forms when silica-rich fluids replace or cement volcanic ash, sediment, or breccia. Its exact geological age cannot be determined visually; similar jasper occurs in many ancient volcanic and sedimentary terrains.

Uses & applications

Used for cabochons, beads, carving, décor, and lapidary collections; occasionally sold as a decorative stone. Common tumbled pieces generally have modest value.

Geological facts

The contrasting white veins may be quartz or chalcedony, while the brown areas are colored by iron oxides. The specimen is more specifically identifiable with a hardness, streak, and acid test.

Field identification & locations

Likely jasper rather than marble or agate because it is opaque and very fine-grained. Brown-and-white jasper is plausible in the Arkansas–Texas region, where silica-rich gravels and chert/jasper are common; locality cannot be confirmed from appearance alone.