sedimentary

Jasper

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Hardness: 6.5 to 7 on the Mohs scale. Color: Varied shades of red, brown, yellow, green, or purple, often patterned or banded. Luster: Vitreous to dull. Crystal structure: Trigonal (microcrystalline/cryptocrystalline). Cleavage: None, exhibits conchoidal fracture. Specific gravity: 2.58 to 2.91.

Hardness: 6
Luster: Vitreous to dull

Identified July 28, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the accumulation of silica-rich sediments or the silicification of organic matter, typically in marine or hydrothermal environments, often dating from Precambrian to Cenozoic eras.

Uses & applications

Used in ornamental carvings, cabochons, jewelry, decorative objects, and by mineral collectors.

Geological facts

Jasper has been used since ancient times to create seals, talismans, and jewelry. The ancient Egyptians carved amulets from red jasper to symbolize the blood of Isis.

Field identification & locations

Found worldwide in association with iron formations and hydrothermal veins. Identified in the field by its hardness (scratches glass), waxy to dull luster, and opaque appearance.

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