sedimentary

Jasper

Jasper (Cryptocrystalline variety of Quartz, SiO2)

AI-generated identification · may be incorrect

Hardness: 6.5-7 on the Mohs scale; Color: Brownish-tan with lighter vein patterns; Luster: Dull to vitreous/waxy; Crystal Structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91

Hardness: 6
Color: Brownish-tan with lighter vein patterns
Luster: Dull to vitreous/waxy

Identified June 13, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the infiltration of silica-rich fluids into volcanic ash or fine-grained sediment. It often forms in hydrothermal environments or through the replacement of organic materials over millions of years.

Uses & applications

Used in gemstone polishing, lapidary arts, decorative beads, and as an ornamental stone in jewelry. Small river-tumbled pieces like this are common in rock collections.

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 in the field by its opacity (it does not transmit light even at the edges), smooth texture, and conchoidal fracture. Commonly found in riverbeds, beaches, and desert regions globally.