sedimentary

Jasper Pebble

Silicon dioxide (SiO2) with iron oxide impurities

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs scale), Color: Reddish-brown with grayish and white veins, Luster: Dull to waxy, Crystal Structure: Microcrystalline/Cryptocrystalline, Specific Gravity: 2.58-2.91

Hardness: 6

Identified July 4, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs scale), Color: Reddish-brown with grayish and white veins, Luster: Dull to waxy, Crystal Structure: Microcrystalline/Cryptocrystalline, Specific Gravity: 2.58-2.91

Formation & geological history

Formed through the deposition of silica from water-rich environments or volcanic ash into sedimentary layers, often colored by iron inclusion during lithification. This specimen likely weathered out of a larger vein and was rounded by water transport.

Uses & applications

Commonly used for lapidary work, jewelry (beads and cabochons), home decor, and as a collector's stone or aquarium gravel.

Geological facts

Jasper is an opaque variety of chalcedony. The name 'Jasper' is derived from the Greek for 'spotted stone'. It was a favorite gemstone in the ancient world, mentioned in several historical and religious texts.

Field identification & locations

Identify in the field by its hardness (cannot be scratched by a steel knife) and its smooth, waxy surface when wet or polished. Commonly found in riverbeds, beaches, and desert environments worldwide.