sedimentary

Red Jasper

Jasper (Silicon Dioxide, SiO2)

Hardness: 6.5-7 (Mohs); Color: Brick red to brownish-red; Luster: Dull to waxy; Crystal Structure: Hexagonal/Microcrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91

Hardness: 6
Color: Brick red to brownish-red
Luster: Dull to waxy

Identified March 26, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs); Color: Brick red to brownish-red; Luster: Dull to waxy; Crystal Structure: Hexagonal/Microcrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91

Formation & geological history

Formed from the deposition of silica in various environments, often as hydrothermal veins or as nodules in sedimentary rocks. The red color is caused by impurities of Iron(III) oxide (hematite). Occurs across many geological eras.

Uses & applications

Used primarily in lapidary art for cabochons, beads, and carvings. Also used historically for seals, talismans, and as an ornamental stone in construction and decoration.

Geological facts

Jasper has been a popular gemstone since antiquity, mentioned in the Bible and used by ancient Greeks and Romans. It is known as the 'Supreme Nurturer' in metaphysical circles.

Field identification & locations

Identify in the field by its opaque nature (unlike translucent carnelian), smooth 'water-worn' texture if found in riverbeds, and its inability to be scratched by a steel knife. Found globally, notably in India, Brazil, and the Southwestern United States.