mineral

Tumbled jasper (likely brecciated or orbicular jasper)

Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide and other mineral inclusions

AI-generated identification · may be incorrect

Opaque brown to reddish, polished surface, vitreous-to-waxy luster, and no visible cleavage; Mohs hardness about 6.5–7, with cryptocrystalline quartz structure and typical specific gravity near 2.6.

Identified August 11, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich groundwater replaces or fills cavities and fractures, incorporating iron oxides and fragmental material; deposits are generally of varied volcanic or sedimentary age rather than one specific age.

Uses & applications

Commonly used for tumbled stones, cabochons, carvings, beads, and ornamental objects; quality depends on pattern, polish, and color contrast.

Geological facts

Jasper is an opaque variety of chalcedony, distinguished from agate by its generally higher opacity. Brown coloration commonly comes from hematite or goethite.

Field identification & locations

Identify it by its opaque appearance, fine-grained texture, high polish, and inability to scratch it with a steel knife; common sources include India, Madagascar, Brazil, Mexico, and the western United States.