sedimentary

Jasper with Quartz Veining

Silicon Dioxide (SiO2) with impurities such as Fe2O3

Hardness: 6.5-7 (Mohs scale); Color: Variegated red, yellow, green, and white; Luster: Dull to waxy; Crystal Structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91

Hardness: 6
Color: Variegated red, yellow, green, and white
Luster: Dull to waxy

Identified March 12, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the deposition of silica from water or hydrothermal fluids in volcanic or sedimentary environments. Most jasper deposits are millions of years old, often associated with silicate-rich waters in areas of high tectonic activity.

Uses & applications

Primary use is in lapidary arts for cabochons, beads, and carvings; also used as an ornamental stone in interior design and by collectors for its unique patterns.

Geological facts

Jasper is an opaque variety of chalcedony. The name comes from the Greek word 'iaspis', meaning 'spotted stone'. It was highly favored in the ancient world for both its beauty and supposed protective properties.

Field identification & locations

Identify in the field by its opacity (even on thin edges), its hardness (will scratch steel and glass), and smooth, curved conchoidal fractures. Commonly found in river beds or areas with exposed silica-rich sedimentary layers globally.

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