sedimentary

Red Jasper

Jasper (Silicon Dioxide, SiO2)

Hardness: 6.5-7 (Mohs scale); Color: Brick red to brownish-red; Luster: Vitreous to dull; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91

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

Identified April 6, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed from the deposition of silica from water-rich environments or within volcanic rock cavities. The red color is caused by the presence of iron oxide (hematite) inclusions within the quartz structure. It can be found in sedimentary bedding or as pebbles in rivers.

Uses & applications

Used primarily in lapidary work for cabochons, beads, and carvings. Historically used for seals and decorative objects. It is also popular in the metaphysical community and for landscaping/ornamental gardens.

Geological facts

Jasper is an opaque variety of chalcedony. The name comes from the Greek word 'iaspis', meaning 'spotted stone.' It has been a popular gemstone for thousands of years, appearing in the jewelry of Ancient Egyptians and Minoans.

Field identification & locations

Identify in the field by its distinctive brick-red color, opacity (light will not pass through the edges), and smooth, curved (conchoidal) fracture surfaces when broken. It cannot be scratched by a steel knife.