mineral

Jasper

Silicon Dioxide (SiO2)

AI-generated identification · may be incorrect

Hardness: 6.5-7 on Mohs scale. Color: Brownish-yellow to reddish-brown, opaque. Luster: Waxy to vitreous. Crystal structure: Trigonal (microcrystalline/cryptocrystalline quartz). Cleavage: None, exhibits conchoidal fracture.

Hardness: 6
Color: Brownish-yellow to reddish-brown, opaque
Luster: Waxy to vitreous

Identified July 24, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the deposition of silica-rich microcrystalline fluids filling cavities, veins, or sedimentary layers, often colored by iron oxides and hydroxides.

Uses & applications

Used primarily for lapidary work, decorative carvings, cabochons in jewelry, tumbling, and rock collecting.

Geological facts

Jasper is an opaque variety of chalcedony. The name 'jasper' comes from the Greek word 'iaspis', meaning 'spotted stone'. Brown and yellow varieties are heavily colored by iron oxide minerals like goethite and limonite.

Field identification & locations

Field identification features include its smooth, waxy feel, conchoidal fracture, complete opacity, and inability to be scratched by steel. Commonly found in riverbeds, gravel deposits, and volcanic regions worldwide.