sedimentary

Jasper

Silicon dioxide (SiO2) with impurities

Hardness: 6.5-7 Mohs; Color: Multi-colored (red, yellow, brown, green); Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None; Conchoidal fracture.

Hardness: 6
Color: Multi-colored (red, yellow, brown, green)
Luster: Vitreous to dull

Identified July 12, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 Mohs; Color: Multi-colored (red, yellow, brown, green); Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None; Conchoidal fracture.

Formation & geological history

Formed from the deposition of silica from water solutions or volcanic ash, often associated with hydrothermal activity. Over time, impurities like iron oxides give it distinct colors and patterns.

Uses & applications

Commonly used in lapidary work for making cabochons, beads, and decorative carvings. Also used as a healing stone in metaphysical communities and as an ornamental stone in jewelry.

Geological facts

Jasper is a microcrystalline variety of quartz. The name comes from the Greek word 'iaspis', meaning spotted stone. It has been used for millennia, appearing in the seals and jewelry of ancient civilizations like the Minoans.

Field identification & locations

Identify in the field by its waxy luster, conchoidal fracture, and opaque appearance (it does not let light through like agate). Commonly found in volcanic regions and riverbeds globally, notably in Oregon, Idaho, and Madagascar.