sedimentary

Jasper Pebble

Jasper (Silicon Dioxide, SiO2)

Hardness: 6.5-7 (Mohs scale); Color: Red-brown with tan veining; Luster: Dull to waxy; Structure: Microcrystalline quartz; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91

Hardness: 6
Color: Red-brown with tan veining
Luster: Dull to waxy

Identified July 14, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs scale); Color: Red-brown with tan veining; Luster: Dull to waxy; Structure: Microcrystalline quartz; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91

Formation & geological history

Formed through the infiltration of silica-rich fluids into sediment or volcanic ash, often during the Proterozoic to Cenozoic eras. This specimen has been water-worn into a smooth river pebble shape.

Uses & applications

Used for lapidary work, jewelry, pocket stones, and decorative landscaping. Jasper is also historically used for making seals and amulets.

Geological facts

Jasper gets its reddish-brown color from high concentrations of iron oxide (hematite or goethite) within the quartz matrix. The name Jasper comes from the Greek word 'iaspis', meaning 'spotted stone'.

Field identification & locations

Identify in the field by its hardness (it will scratch glass), opacity, and smooth, rounded water-worn texture. Commonly found in riverbeds and coastal gravel deposits globally.