sedimentary

Red Jasper Pebble

Microcrystalline Quartz (Chalcedony), SiO2

Hardness of 6.5 to 7 on the Mohs scale, red to reddish-brown color due to iron oxide impurities, waxy to vitreous luster, trigonal crystal system with a microcrystalline structure, conchoidal fracture with no true cleavage, specific gravity around 2.58 to 2.91.

Identified July 29, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the precipitation of silica-rich fluids in marine or terrestrial environments, often originating from hydrothermal processes or silicious ooze that underwent diagenesis and low-grade metamorphism over millions of years.

Uses & applications

Used primarily in lapidary arts, ornamental carvings, polished cabochons for jewelry, and as a popular collector specimen for rockhounds.

Geological facts

Jasper has been used since ancient times by various civilizations to create seals, talismans, and decorative items. Its rich red color comes from finely dispersed hematite inclusions within the silica matrix.

Field identification & locations

Easily identified in the field by its distinct red color, smooth water-worn pebble shape in riverbeds or beaches, high hardness that scratches glass, and waxy luster. Commonly found in stream beds, marine beaches, and glacial till worldwide.

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Banded Siltstone / Mudstone Pebble

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Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)

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Shale

Shale (clastic sedimentary rock)

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