sedimentary

Jasper

Microcrystalline Quartz (SiO2)

Hardness: 7 on Mohs scale. Color: Red, brown, yellow, green, or multicolored due to iron impurities. Luster: Vitreous to dull. Crystal structure: Trigonal (microcrystalline aggregates). Cleavage: None, exhibits conchoidal fracture. Specific gravity: 2.58 - 2.91.

Hardness: 7 on Mohs scale
Luster: Vitreous to dull

Identified July 30, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed by the precipitation of silica from water rich in silica and iron, often in marine environments or hydrothermal systems, subsequently undergoing diagenesis. Geological age varies widely from Precambrian to Cenozoic.

Uses & applications

Used in ornamental carvings, cabochons, jewelry, lapidary art, and decorative items. Historically used for tools and weaponry by ancient civilizations.

Geological facts

Jasper has been utilized by humans for thousands of years, notably for making seals, talismans, and arrowheads. Red jasper gets its vibrant color from hematite inclusions.

Field identification & locations

Identified in the field by its opaque appearance, waxy to dull luster, conchoidal fracture, and inability to be scratched by steel. Commonly found worldwide in ancient riverbeds, sedimentary deposits, and volcanic regions.