sedimentary

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs); Color: Brick red with dark inclusions; Luster: Vitreous to waxy; Crystal Structure: Microcrystalline; Cleavage: None; Specific Gravity: 2.58-2.91

Hardness: 6
Color: Brick red with dark inclusions
Luster: Vitreous to waxy

Identified July 7, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs); Color: Brick red with dark inclusions; Luster: Vitreous to waxy; Crystal Structure: Microcrystalline; Cleavage: None; Specific Gravity: 2.58-2.91

Formation & geological history

Formed through the deposition of silica-rich fluids in volcanic or sedimentary environments, where microcrystalline quartz mixes with iron oxides during the silicification process.

Uses & applications

Used primarily in lapidary work for cabochons, beads, carvings, and tumbled stones; also historically used for seal stones and ritual objects.

Geological facts

The red color comes from iron oxide (hematite). In ancient cultures, it was known as the 'bringer of courage' and was often used to adorn the breastplates of high priests and warriors.

Field identification & locations

Identify in the field by its opaque red color, conchoidal fracture pattern, and inability to be scratched by a steel knife. Commonly found in riverbeds and desert environments globally, notably in India, Brazil, and the USA.