sedimentary

Jasper and Chalcedony Pebble

Silicon Dioxide (SiO2)

AI-generated identification · may be incorrect

Hardness: 6.5-7 on Mohs scale; Color: Blue-grey with brown inclusions; Luster: Waxy to vitreous; Crystal structure: Microcrystalline quartz (cryptocrystalline)

Hardness: 6
Color: Blue-grey with brown inclusions
Luster: Waxy to vitreous

Identified July 29, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 on Mohs scale; Color: Blue-grey with brown inclusions; Luster: Waxy to vitreous; Crystal structure: Microcrystalline quartz (cryptocrystalline)

Formation & geological history

Formed through the deposition of silica-rich fluids in sedimentary environments or volcanic cavities, often shaped and smoothed over thousands of years by water transport in rivers or ocean currents.

Uses & applications

Commonly used in lapidary arts, tumbled stones, ornamental carvings, and as a collector's specimen.

Geological facts

Chalcedony and jasper are varieties of quartz that have been used by humans for thousands of years to create tools, beads, and decorative items due to their fine grain and toughness.

Field identification & locations

Can be identified in the field by its conchoidal fracture, waxy luster, and resistance to scratching by a steel knife. Frequently found in riverbeds, lake shores, and gravel deposits.