mineral

Tumbled jasper (possibly orbicular jasper)

Microcrystalline quartz, SiO₂; jasper is an opaque variety of chalcedony

AI-generated identification · may be incorrect

Rounded, polished pebble with gray-white and dark gray-green patches. Quartz hardness is 6.5–7 Mohs; vitreous to waxy luster, cryptocrystalline structure, no cleavage, and specific gravity about 2.6. The image does not show enough detail for a confident variety-level identification.

Identified September 22, 2026More mineral →

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Physical properties

Formation & geological history

Jasper forms when silica-rich fluids fill or replace rock, with iron and other impurities producing colors and patterns; it occurs in many geological ages and settings. Tumbling has mechanically smoothed and polished the specimen.

Uses & applications

Used for jewelry, ornaments, and lapidary collections; jasper is generally decorative rather than an industrial material.

Geological facts

Jasper’s color and pattern vary widely, and trade names often refer to appearance or locality rather than a distinct mineral species.

Field identification & locations

Its opaque, patterned appearance and polished surface are consistent with jasper, but similar chalcedony varieties can look alike. Jasper occurs worldwide, including India, Brazil, Australia, and the United States.