sedimentary

Jasper

Jasper (Silicon Dioxide, SiO2)

Hardness: 6.5-7 on Mohs scale; Color: Reddish-brown with variegated patterns; Luster: Dull to greasy; Crystal Structure: Microcrystalline/Cryptocrystalline (Trigonal); Cleavage: None; Specific Gravity: 2.58-2.91

Hardness: 6
Color: Reddish-brown with variegated patterns
Luster: Dull to greasy

Identified June 8, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the deposition of silica from water or during volcanic activity, often in sedimentary environments or as fillings in cavities. Its color usually comes from iron inclusions. Ages range from millions to several billion years old.

Uses & applications

Used primarily in lapidary arts for cabochons, beads, and decorative carvings. It has a high polishing capacity and is highly valued in the 'healing stone' and metaphysical community.

Geological facts

Jasper is an opaque variety of chalcedony. Historically, it was known as the 'supreme nurturer' and has been used by various cultures for talismans and seal stones for millennia.

Field identification & locations

Identify it by its opacity (it does not transmit light even at the edges), smooth conchoidal fracture, and inability to be scratched by a steel knife. It is common in riverbeds and mountainous regions globally.