sedimentary

Jasper

Jasper (Silicon Dioxide) - SiO2

Hardness: 6.5-7 (Mohs scale); Color: Variegated orange, tan, white, and red; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (Conchoidal fracture); Specific gravity: 2.58-2.91

Hardness: 6
Color: Variegated orange, tan, white, and red
Luster: Vitreous to waxy

Identified April 13, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the deposition of silica from water-rich environments, often in volcanic ash beds or sedimentary deposits where silica replaces organic material or fills voids. This specific specimen shows signs of tumbling/polishing.

Uses & applications

Primarily used for lapidary arts, jewelry (cabochons, beads), decorative ornaments, and as a popular collector's stone due to its patterns and colors.

Geological facts

The name Jasper means 'spotted or speckled stone.' It is a dense, opaque variety of chalcedony. Historically, it was a favorite gemstone in the ancient world, frequently used for seals and amulets.

Field identification & locations

Identify in the field by its hardness (will scratch glass but not quartz), its opacity (even on thin edges), and its typical conchoidal fracture. Often found as water-worn pebbles in riverbeds or in coastal regions.