mineral
Tumbled jasper (possibly orbicular jasper)
Microcrystalline quartz, SiO₂; jasper is an opaque variety of chalcedony
AI-generated identification · may be incorrectRounded, 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.
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Physical properties
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.
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.
