sedimentary

Jasper

Microcrystalline Quartz (SiO2)

Hardness: 6.5 to 7 on the Mohs scale; Color: Red, brown, yellow, green, or multicolored; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline/cryptocrystalline aggregate); Cleavage: None, exhibits conchoidal fracture; Specific gravity: 2.58 to 2.91

Hardness: 6
Color: Red, brown, yellow, green, or multicolored
Luster: Vitreous to dull

Identified August 5, 2026More sedimentary →

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Physical properties

Formation & geological history

Forms from the precipitation of silica-rich fluids in sedimentary environments or hydrothermal veins, often incorporating iron oxides which give it the characteristic red coloration. Geological age varies widely from Precambrian to Cenozoic.

Uses & applications

Used primarily in lapidary arts, making cabochons, beads, ornamental carvings, and jewelry, as well as valued by mineral collectors.

Geological facts

Jasper has been used since ancient times to create seals, talismans, and decorative items. Red jasper specifically gets its vibrant color from high concentrations of hematite inclusions.

Field identification & locations

Easily identified in the field by its opaque nature, waxy-to-dull luster, conchoidal fracture, and inability to be scratched by a steel knife. Found worldwide in riverbeds, beaches, and mountainous regions.