sedimentary

Red Jasper

Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions

Hardness: 6.5-7 (Mohs scale); Color: Brick red to deep terracotta; Luster: Dull to vitreous (waxy when polished); Crystal Structure: Microcrystalline/Trigonal; Cleavage: None (Conchoidal fracture); Specific Gravity: 2.58-2.91

Hardness: 6
Color: Brick red to deep terracotta
Luster: Dull to vitreous (waxy when polished)

Identified March 25, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the deposition of silica from water or volcanic ash, which then solidifies into a microcrystalline quartz. The red color comes from high iron/hematite content during the lithification process. It is found in geological strata ranging from Precambrian to recent.

Uses & applications

Commonly used in lapidary for jewelry (beads, cabochons), ornamental carvings, and as a 'grounding' stone in metaphysical collecting. Historically used for making tools and seals.

Geological facts

In ancient times, Red Jasper was known as the 'mother of all stones' and was often used in Egyptian amulets. It is an opaque variety of chalcedony that never loses its color, even when exposed to intense UV light.

Field identification & locations

Identify in the field by its opacity (unlike carnelian, it does not let light through), its smooth conchoidal fracture, and it cannot be scratched by a steel knife. Common locations include India, Brazil, South Africa, and the southwestern United States.

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