sedimentary

Jasper

Silicon dioxide (SiO2)

Hardness: 6.5 - 7 (Mohs); Color: Dark green with mottled patterns; Luster: Vitreous to waxy; Crystal structure: Microcrystalline/hexagonal; Specific gravity: 2.6 - 2.9

Hardness: 6
Color: Dark green with mottled patterns
Luster: Vitreous to waxy

Identified June 18, 2026More sedimentary →

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Physical properties

Hardness: 6.5 - 7 (Mohs); Color: Dark green with mottled patterns; Luster: Vitreous to waxy; Crystal structure: Microcrystalline/hexagonal; Specific gravity: 2.6 - 2.9

Formation & geological history

Formed through the precipitation of silica from mineral-rich fluids in volcanic or sedimentary environments, often associated with hydrothermal circulation or the silicification of organic matter.

Uses & applications

Used primarily in lapidary arts, jewelry (cabochons), interior decoration, and as a popular stone for metaphysical or collector purposes.

Geological facts

Jasper is an opaque variety of chalcedony. The name comes from the Old French word 'jaspre', meaning 'spotted or speckled stone'. Green jasper was highly valued in ancient Egypt and Mesopotamia for seals and amulets.

Field identification & locations

Identify by its hardness (cannot be scratched by a steel knife), smooth waxy feel when polished, and opacity. Commonly found in riverbeds, beaches, and volcanic regions globally.