sedimentary

Red Jasper

Silicon Dioxide (SiO2)

Hardness: 6.5–7 (Mohs scale), Color: Red to brownish-red due to iron inclusions, Luster: Vitreous to dull, Crystal Structure: Trigonal (microcrystalline/cryptocrystalline), Cleavage: None, Fracture: Conchoidal, Specific Gravity: 2.58–2.91

Hardness: 6

Identified April 19, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the deposition of silica from mineral springs or hydrothermal veins. The red color is caused by the inclusion of fine iron particles and impurities during the silica precipitation process.

Uses & applications

Commonly used for lapidary work, decorative carvings, cabochons for jewelry, pocket stones, and architectural ornamentation.

Geological facts

Red jasper was known in antiquity as a 'warrior stone.' It has been used for millennia for seals, amulets, and ring stones. It is an opaque variety of chalcedony.

Field identification & locations

Identify in the field by its intense red color, extreme hardness (it will scratch glass), and opaque nature (light will not pass through it unlike agate). It often displays a waxy or smooth feel on broken surfaces.