sedimentary

Jasper

Silicon Dioxide (SiO2)

Hardness: 6.5-7 on Mohs scale; Color: Reddish-brown with tan/pink bands; Luster: Vitreous to waxy (especially when polished); Crystal Structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91

Hardness: 6
Color: Reddish-brown with tan/pink bands
Luster: Vitreous to waxy (especially when polished)

Identified June 22, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the deposition of silica from water-rich environments, often associated with volcanic activity or hydrothermal veins where silica-rich fluids fill cracks and solidify over millions of years.

Uses & applications

Commonly used in jewelry as cabochons, beads, and decorative ornaments. It is also a popular collector's item and used in metaphysical practices.

Geological facts

Jasper is an opaque variety of chalcedony. The name comes from the Greek word 'iaspis', meaning spotted stone. It has been used for seals and amulets since ancient Mesopotamian times.

Field identification & locations

Identify by its hardness (cannot be scratched by a steel knife), opaque nature, and smooth, waxy surface when tumbled. Frequently found in riverbeds or volcanic deposits globally.