mineral

Red Jasper

Jasper (Silicon Dioxide, SiO2)

Hardness: 6.5-7 Mohs; Color: Brick red to brownish-red; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91

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

Identified March 30, 2026More mineral →

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Physical properties

Hardness: 6.5-7 Mohs; Color: Brick red to brownish-red; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91

Formation & geological history

Formed through the infiltration of silica-rich fluids into volcanic ash or fine-grained sediment. Its red color comes from high iron inclusions (hematite). It can be found in strata dating back to the Precambrian era.

Uses & applications

Used primarily in jewelry making (cabochons, beads), decorative ornaments, and metaphysical collecting. Historically used for making flint-style tools due to its conchoidal fracture.

Geological facts

In antiquity, Red Jasper was known as the 'stone of endurance' and was frequently used in Egyptian amulets and Babylonian cylinder seals. It is an opaque variety of chalcedony.

Field identification & locations

Identify in the field by its opaque deep red color, smooth waxy feel when wet, and inability to be scratched by a steel knife. Common in the western USA (Oregon, Idaho), South Africa, and Brazil.