mineral

Jasper

Silicon Dioxide (SiO2)

Hardness: 6.5 to 7 on Mohs scale. Color: Highly variable, often red, yellow, brown, or green due to iron inclusions. Luster: Dull to Vitreous. Crystal Structure: Hexagonal (Microcrystalline). Cleavage: None (Conchoidal fracture). Specific Gravity: 2.58 to 2.91.

Hardness: 6
Luster: Dull to Vitreous

Identified January 5, 2026More mineral →

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Physical properties

Formation & geological history

Formed in an environment where silica-rich fluids permeate through volcanic ash or sedimentary rocks. The variety shown appears to be a brecciated or orbicular forms, often found in hydrothermal veins or as nodules in volcanic rock.

Uses & applications

Used primarily in jewelry as gemstones and cabochons, for decorative interior ornaments, and as a material for carvings and mosaics.

Geological facts

Jasper is an opaque variety of chalcedony. The name comes from the Old French word 'jaspre', meaning 'spotted or speckled stone'. It has been used for thousands of years as a seal material and an ornamental stone in many cultures.

Field identification & locations

Identify in the field by its opacity, characteristic waxy luster when broken, and inability to be scratched by a steel knife. Common locations include the Western United States (Oregon, Idaho), Australia, India, and Brazil.