sedimentary

Red Jasper (Jasper)

Silicon Dioxide (SiO₂)

Hardness: 6.5-7 Mohs; Color: Brick red to brownish-red; Luster: Dull to Vitreous when polished; Crystal Structure: Trigonal/Microcrystalline; Cleavage: None (Conchoidal fracture); Specific Gravity: 2.58-2.91

Hardness: 6
Color: Brick red to brownish-red
Luster: Dull to Vitreous when polished

Identified March 28, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the deposition of silica from water-rich environments, often within sedimentary beds or in hydrothermal veins where fine-grained silica mingles with iron oxide (giving it the red color). It can range from Precambrian to modern ages.

Uses & applications

Used widely in lapidary work for cabochons, beads, and jewelry. It is also used as a decorative stone in mosaics, aquarium gravel, and as a spiritual gemstone in metaphysical communities.

Geological facts

Jasper is highly opaque compared to other varieties of chalcedony. Historically, it was known as the 'supreme nurturer' across various ancient cultures and was used for amulets in Ancient Egypt.

Field identification & locations

Identify by its rich red color, extreme hardness (it will scratch glass), and smooth, waxy feel when wet. Often found in riverbeds or gravel deposits near volcanic or sedimentary regions. Common in the Western US, South Africa, and Brazil.