sedimentary

Red Jasper

Silicon Dioxide (SiO2) with Hematite (Fe2O3)

Hardness: 6.5-7 (Mohs scale); Color: Brick red to brownish red due to iron inclusion; Luster: Dull to Vitreous (when polished); Crystal Structure: Microcrystalline/Trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91.

Hardness: 6
Color: Brick red to brownish red due to iron inclusion
Luster: Dull to Vitreous (when polished)

Identified March 25, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the hydro-thermal process where silica-rich fluids permeate through volcanic or sedimentary rock, consolidating with iron-impurities. It is found in ancient geological formations across all prehistoric ages.

Uses & applications

Predominantly used for ornamental purposes, semi-precious jewelry (beads, cabochons), carvings, and as a popular stone for meditation and crystal collecting.

Geological facts

Historically known as the 'Stone of Endurance,' Red Jasper was used by ancient civilizations for amulets and seals. It is a variety of chalcedony that is made opaque by high mineral content.

Field identification & locations

Identify in the field by its deep red color, opacity (light will not pass through it even on thin edges), and its ability to scratch glass. Commonly found in riverbeds or mountain ranges in the USA, Brazil, South Africa, and India.

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