sedimentary

Red Jasper

SiO2 (Silicon Dioxide with Iron inclusions)

Hardness: 6.5-7 (Mohs scale); Color: Brick red to brownish red; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91

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

Identified March 28, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the deposition of silica from water. The red color comes from iron impurities. It is typically found in sedimentary or metamorphic environments, often associated with banded iron formations from the Precambrian era (up to 3 billion years old).

Uses & applications

Predominantly used as a gemstone for jewelry (cabochons, beads), decorative ornaments, and metaphysical 'healing' stones. Historically used for making tools like scrapers and seals due to its hardness.

Geological facts

Ancient Egyptians used red jasper in amulets to represent the fertility of Mother Isis. It is a microcrystalline variety of quartz that can contain up to 20% foreign materials, which determines its unique patterns and color depth.

Field identification & locations

Identify in the field by its opaque nature (it does not transmit light even at the edges), its deep red color, and its ability to scratch glass. It is commonly found in India, Brazil, Egypt, and the Southwestern USA.

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