sedimentary

Jasper Pebble

Tumbled Jasper (Microcrystalline Quartz, SiO2)

AI-generated identification · may be incorrect

Hardness: 6.5–7 (Mohs scale); Color: Dark olive green/brown; Luster: Waxy to vitreous (especially when wet); Structure: Cryptocrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58–2.91.

Hardness: 6
Color: Dark olive green/brown
Luster: Waxy to vitreous (especially when wet)

Identified March 24, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the infiltration of silica-rich fluids into sedimentary or volcanic rocks, often congregating around impurities that provide color. This specific pebble was formed and shaped by alluvial processes (river or stream tumbling).

Uses & applications

Commonly used for lapidary work (tumbling/polishing), garden decoration, and metaphysical 'healing' stones. In high-quality forms, used for cabochons in jewelry.

Geological facts

Jasper is an opaque variety of chalcedony. The name comes from the Greek word 'iaspis', meaning spotted stone. It has been used as a gemstone since antiquity and was a favorite in the Minoan civilization.

Field identification & locations

Identify by its opacity (does not let light through even at the edges), smoothness, and hardness (cannot be scratched by a steel knife). Commonly found in riverbeds and on beaches worldwide.