sedimentary

Red Jasper

Silicon Dioxide (SiO2)

Hardness: 6.5-7 (Mohs scale); Color: Brick red to brownish red; Luster: Vitreous to waxy; Crystal Structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91.

Hardness: 6
Color: Brick red to brownish red
Luster: Vitreous to waxy

Identified July 21, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs scale); Color: Brick red to brownish red; Luster: Vitreous to waxy; Crystal Structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91.

Formation & geological history

Red jasper is a variety of chalcedony that forms through the precipitation of silica from groundwater in sedimentary environments, often colored by iron oxide (hematite) inclusions. It can also form during hydrothermal processes.

Uses & applications

Primarily used as a gemstone for jewelry (cabochons, beads), decorative carvings, and as a popular specimen for rock tumbling and metaphysical collections.

Geological facts

The name comes from the Greek word 'iaspis', meaning spotted stone. It was known as the 'rain-bringer' in Native American cultures and was frequently used for amulets and carvings in ancient Egypt.

Field identification & locations

Identify in the field by its opaque brick-red color, smooth waxy surface when broken (conchoidal fracture), and high hardness (will scratch glass). Commonly found in riverbeds and arid regions globally, notably in India, Brazil, and the USA.