mineral

Iron-stained jasper pebble

Microcrystalline quartz (SiO₂), colored by iron oxides; likely jasper

AI-generated identification · may be incorrect

Opaque, rounded, orange-brown with yellow and gray patches and a smooth, possibly naturally water-worn surface. Quartz hardness is 7 Mohs; vitreous to dull luster, trigonal crystal structure, no cleavage, and specific gravity around 2.6.

Identified October 11, 2026More mineral →

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Physical properties

Formation & geological history

Jasper forms when silica-rich fluids or sediments become cemented, with iron oxides producing the color. The pebble was likely rounded by stream or beach abrasion; its geological age and source cannot be determined from the image.

Uses & applications

Used as a decorative stone, in lapidary work and jewelry, or collected as a polished-looking pebble.

Geological facts

Jasper is an opaque variety of chalcedony, itself a microcrystalline form of quartz; iron-bearing impurities create its varied colors.

Field identification & locations

Look for opacity, fine grain, and hardness sufficient to scratch glass; a streak or scratch test on this specimen is not advisable if it is valued. Iron-stained jasper and similar quartz pebbles occur worldwide in gravel deposits.