mineral

Tumbled yellow jasper or silicified rock fragment

Microcrystalline quartz (chalcedony), SiO₂, likely iron-oxide colored

AI-generated identification · may be incorrect

Opaque cream-yellow to orange-brown, with a dull to waxy luster and irregular conchoidal-looking fracture; estimated Mohs hardness 6.5–7, no visible cleavage, and specific gravity around 2.6. The rounded edges suggest natural abrasion or tumbling.

Identified September 13, 2026More mineral →

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Physical properties

Formation & geological history

Likely silica-rich material formed when groundwater replaced or cemented volcanic, sedimentary, or organic material, with iron oxides producing the yellow-brown coloration. Exact age and locality cannot be determined from the image.

Uses & applications

Used for cabochons, beads, carvings, lapidary pieces, and decorative stone; not generally used as a construction aggregate in this small form.

Geological facts

Jasper is an opaque variety of chalcedony, commonly distinguished from agate by its lack of translucent banding. Yellow coloration typically reflects limonite or goethite inclusions.

Field identification & locations

Field identification requires a scratch test against glass, which it should scratch, plus inspection for a waxy surface and absence of cleavage; visual identification alone is uncertain. Common sources include India, Madagascar, Brazil, Australia, and the western United States.