mineral

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Hardness: 6.5-7 (Mohs scale), Color: Teracotta red to deep brownish-red, Luster: Vitreous to dull, Crystal Structure: Trigonal (Microcrystalline), Cleavage: None/Conchoidal fracture, Specific Gravity: 2.58-2.91

Hardness: 6

Identified March 30, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the accumulation of volcanic ash or silica-rich sediments where iron-oxides (Hematite) permeate the structure during the petrification process. Can be found in geological formations ranging from the Precambrian to the Cenozoic eras.

Uses & applications

Used extensively in jewelry (cabochons, beads), decorative lapidary arts, and ornamental carvings. Historically used for making tools due to its conchoidal fracture which creates sharp edges.

Geological facts

In antiquity, Red Jasper was known as the 'rain-bringer' and was highly prized by Egyptians and Native Americans for amulets. It is a crypto-crystalline variety of quartz, meaning its crystals are too small to be seen even under a light microscope.

Field identification & locations

Identify in the field by its opaque red color and smooth, shell-like (conchoidal) fracture pattern. It will easily scratch glass but cannot be scratched by a steel knife. Common in diverse locations like India, Brazil, Madagascar, and the Southwestern United States.

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