mineral

Jasper

Silicon Dioxide (SiO2)

Hardness: 6.5-7 (Mohs scale); Color: Variegated with red, brown, and grey-green tones; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91.

Hardness: 6
Color: Variegated with red, brown, and grey-green tones
Luster: Vitreous to dull

Identified June 21, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the deposition of silica from water or hydrothermal fluids, often in volcanic or sedimentary environments. It is a microcrystalline variety of quartz.

Uses & applications

Commonly used as gemstones for jewelry (cabochons), ornamental carvings, and historical use as seal stones.

Geological facts

Jasper has been used as a gemstone since antiquity; it was mentioned in the Bible and was highly valued in ancient civilizations for its supposed healing and protective properties.

Field identification & locations

Identify by its waxy luster, variety of colors, and the fact that it cannot be scratched by a steel knife. Frequently found in riverbeds or as nodules in volcanic rock.