sedimentary

Tumbled jasper (likely picture jasper or iron-rich jasper)

Microcrystalline quartz/chalcedony, SiO₂, colored by iron oxides

AI-generated identification · may be incorrect

Typically Mohs 6.5–7; opaque orange-brown with darker banding, earthy-to-dull luster, and no visible cleavage. Its rounded shape and smooth surface indicate human tumbling or natural abrasion.

Identified August 10, 2026More sedimentary →

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Physical properties

Typically Mohs 6.5–7; opaque orange-brown with darker banding, earthy-to-dull luster, and no visible cleavage. Its rounded shape and smooth surface indicate human tumbling or natural abrasion.

Formation & geological history

Jasper forms when silica-rich fluids replace or cement sediments, with iron oxides producing red, yellow, and brown colors; banding reflects changing sediment or fluid chemistry. Deposits are generally geologically ancient, commonly Paleozoic to Precambrian.

Uses & applications

Used for cabochons, beads, carvings, ornamental objects, and inexpensive collected specimens; rarely used as a minor decorative stone.

Geological facts

The specimen most resembles picture jasper or scenic jasper, but an exact variety requires close inspection of its patterns and locality. Jasper is a dense variety of chalcedony rather than a single mineral species.

Field identification & locations

Identify it by its opaque appearance, fine grain, strong toughness, waxy/dull luster, and resistance to scratching by a steel knife; quartz should scratch glass. Common sources include Oregon, Utah, Idaho, Brazil, Madagascar, and Australia.