sedimentary

Jasper and Quartz Pebble

Silicon Dioxide (SiO2) microcrystalline quartz

Hardness: 6.5-7 on the Mohs scale. Color: Multicolored with white, grey, and iron-stained brown/orange patches. Luster: Vitreous to waxy. Crystal structure: Trigonal (microcrystalline/cryptocrystalline). Cleavage: None, exhibits conchoidal fracture. Specific gravity: 2.60-2.65.

Hardness: 6
Luster: Vitreous to waxy

Identified August 3, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the deposition of silica-rich fluids in sedimentary environments or hydrothermal veins, subsequently weathered, transported by water, and naturally tumbled into a smooth pebble by wave action in a marine or river environment.

Uses & applications

Used for lapidary arts, decorative landscaping, tumbling, wire-wrapping jewelry, and as a collector specimen.

Geological facts

Water-worn pebbles like this one develop a smooth, polished exterior due to years of abrasion by sand and other stones in high-energy aquatic environments. The orange and brown colors are typically caused by iron oxide staining.

Field identification & locations

Easily identified by its smooth, water-worn shape, high hardness (will scratch glass), and lack of cleavage. Found on beaches, riverbeds, and gravel bars worldwide.

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Sandstone or Siltstone

Arenite (if sandstone)

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Quartz pebble

Silicon dioxide (SiO2)

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Generic Pebble / Rock Fragment

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Banded Siltstone / Mudstone Pebble

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