sedimentary

Red Jasper

Silicon Dioxide (SiO2) - variety of Chalcedony

AI-generated identification · may be incorrect

Hardness: 6.5–7 on Mohs scale; Color: Terracotta red to brownish-red; Luster: Vitreous to dull; Crystal structure: Hexagonal (trigonal microcrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.58–2.91

Hardness: 6
Color: Terracotta red to brownish-red
Luster: Vitreous to dull

Identified March 16, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the deposition of silica from volcanic ash or hydrothermal solutions into cracks and cavities within sedimentary and igneous environments. It is an opaque variety of chalcedony that owes its red color to iron inclusions (hematite). Specimens can date back to the Proterozoic or Paleozoic eras.

Uses & applications

Primarily used for lapidary work including jewelry, cabochons, beads, and polished palm stones. Also utilized for decorative carvings and as a historical gemstone for amulets and seals.

Geological facts

In ancient times, Red Jasper was known as the 'bringer of courage' and was often used in Egyptian amulets shaped like the 'Knot of Isis.' It is considered a stone of endurance and stability in various metaphysical traditions.

Field identification & locations

Identify in the field by its deep red color, opacity (it does not transmit light even on thin edges), and smooth, shell-like (conchoidal) fracture pattern. Commonly found in South Africa, Brazil, India, and the southwestern United States.