sedimentary

Jasper

Silicon dioxide (SiO2) with impurities

Hardness: 6.5-7 (Mohs scale); Color: Yellowish-brown, mustard, ochre; Luster: Vitreous to waxy; Structure: Microcrystalline quartz; Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91

Hardness: 6
Color: Yellowish-brown, mustard, ochre
Luster: Vitreous to waxy

Identified June 17, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs scale); Color: Yellowish-brown, mustard, ochre; Luster: Vitreous to waxy; Structure: Microcrystalline quartz; Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91

Formation & geological history

Formed from the deposition of silica from water solutions into cracks or holes in volcanic or sedimentary rocks. The yellow/brown color is primarily due to the presence of goethite or iron oxides.

Uses & applications

Used frequently in lapidary arts for cabochons, beads, and decorative carvings. Also popular as a tumbled stone and for metaphysical collections.

Geological facts

Jasper is an opaque variety of chalcedony. The name comes from the Greek word 'iaspis', meaning 'spotted stone', though this specimen shows more uniform ochre banding and inclusions.

Field identification & locations

Identify in the field by its opacity (unlike translucent agate) and its hardness—it will easily scratch glass but cannot be scratched by a steel knife. Common in desert regions and riverbeds.