sedimentary

Red Jasper (in Quartz/Chalcedony)

Silicon Dioxide (SiO2) with iron oxide inclusions

Hardness: 6.5-7 on Mohs scale; Color: Red to reddish-brown with white/gray translucent zones; Luster: Vitreous to waxy; Crystal structure: Microcrystalline/Trigonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.58-2.91

Hardness: 6
Color: Red to reddish-brown with white/gray translucent zones
Luster: Vitreous to waxy

Identified May 27, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the deposition of silica-rich fluids in volcanic or sedimentary environments, often associated with iron-rich sediments which give the jasper its red color. This specific specimen appears water-worn, likely from a river or beach environment.

Uses & applications

Used primarily for lapidary work, jewelry making (cabochons), interior decoration, and as a popular specimen for rock tumbling and metaphysical collections.

Geological facts

Jasper is an opaque variety of chalcedony. The red color is usually attributed to the presence of hematite inclusions. In antiquity, it was known as the 'mother of all stones.'

Field identification & locations

Identify in the field by its hardness (will scratch glass but not be scratched by a steel knife), smooth waxy feel when wet, and its characteristic dull-red to orange-red opacity mixed with translucent quartz. Commonly found in gravel pits, riverbeds, and beaches across North America and Africa.

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