sedimentary

Jasper

Silicon dioxide (SiO2) with impurities

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs scale), Color: Rusty yellow, orange, and brown, Luster: Dull to waxy/greasy, Structure: Microcrystalline quartz, Cleavage: None (conchoidal fracture).

Hardness: 6

Identified July 14, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs scale), Color: Rusty yellow, orange, and brown, Luster: Dull to waxy/greasy, Structure: Microcrystalline quartz, Cleavage: None (conchoidal fracture).

Formation & geological history

Formed through the infiltration of silica-rich fluids into volcanic ash or fine-grained sediments, typically undergoing low-grade metamorphism or sedimentary compaction over millions of years.

Uses & applications

Used primarily in lapidary arts, jewelry (cabochons and beads), and as a collector's specimen due to its unique patterns and colors.

Geological facts

The name 'Jasper' is derived from the Greek word 'iaspis', meaning spotted stone. It is a variety of chalcedony that is made opaque by high concentrations of mineral impurities.

Field identification & locations

Commonly found in river beds, beaches, and desert environments. It can be identified by its hardness (it will scratch glass) and its opaque, smooth surface when wet or polished.