sedimentary

Jasper

Silicon Dioxide (SiO2) microcrystalline quartz

Hardness: 6.5 to 7 on the Mohs scale; Color: Varies widely including brown, red, yellow, green, and patterned; 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 August 2, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed from silica-rich solutions in sedimentary or volcanic environments, often resulting from the deposition of silica in cavities or cracks, or alteration of sediments during diagenesis.

Uses & applications

Widely used in lapidary arts for making cabochons, beads, decorative carvings, spheres, and jewelry, as well as valued by collectors.

Geological facts

Jasper has been used since ancient times to create seals, signet rings, and intricate ornamental objects. Its diverse patterns and colors are due to trace mineral inclusions such as iron oxides and clay.

Field identification & locations

Identified easily by its opaque nature, high hardness, waxy-to-vitreous luster on polished surfaces, and distinct multicolored patterns. Found globally in riverbeds, beaches, and mountainous regions.

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