mineral

Tumbled green jasper (probable)

Jasper, opaque microcrystalline quartz (SiO₂), colored by iron and other impurities

AI-generated identification · may be incorrect

Opaque olive-green, finely granular, and vitreous to waxy; Mohs hardness about 6.5–7, no visible cleavage, conchoidal fracture, and typically specific gravity 2.5–2.7. The smooth shape and glossy surface indicate tumbling/polishing.

Identified August 12, 2026More mineral →

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Physical properties

Formation & geological history

Jasper forms when silica-rich fluids replace or cement volcanic ash, sediments, or altered rock; its exact geological age depends on locality, commonly ranging from Precambrian to Cenozoic. Green coloration may result from chlorite, epidote, actinolite, or iron-bearing minerals.

Uses & applications

Used for beads, cabochons, carvings, and ornamental objects; it has minor decorative-stone value rather than major industrial use.

Geological facts

Jasper is a variety of chalcedony/microcrystalline quartz, though the term is often applied broadly to opaque silica-rich rocks. Color and patterns vary greatly by locality.

Field identification & locations

Identify it by its opacity, fine texture, glassy polish, and resistance to scratching; a steel file should not easily scratch it. Common sources include India, Madagascar, Brazil, Uruguay, and the western United States.