sedimentary

Banded Jasper

Silicon Dioxide (SiO2) with iron oxide impurities

Hardness: 6.5 to 7 on Mohs scale; Color: Reddish-brown with white and yellow swirls; Luster: Vitreous to waxy (when polished); Crystal Structure: Microcrystalline/Trigonal (Cryptocrystalline); Cleavage: None; Specific Gravity: 2.58-2.91

Hardness: 6
Color: Reddish-brown with white and yellow swirls
Luster: Vitreous to waxy (when polished)

Identified May 12, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed via the accumulation of silica-rich fluids in volcanic ash or sedimentary deposits, where iron oxides create the distinct banding. These often form in Precambrian to Cenozoic geological ages.

Uses & applications

Used primarily in jewelry (cabochons, beads), decorative carvings, and as a popular pocket stone or meditation aid in crystal healing communities.

Geological facts

Jasper is an opaque variety of chalcedony. The name 'Jasper' is derived from the Greek word 'iaspis', meaning 'spotted stone'. It was a favorite gem in the ancient world, mentioned in the Bible and worn by Babylonian kings.

Field identification & locations

Identified in the field by its opacity (unlike translucent agate), conchoidal fracture, and smooth patterns that do not follow clean lines. Commonly found in riverbeds and desert environments such as those in India, Brazil, and the Southwestern USA.

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