Mineral

Jasper

Jasper (Silicon Dioxide, SiO2)

Hardness: 6.5-7 (Mohs); Color: Reddish-brown, tan, and cream bands; Luster: Vitreous to waxy; Crystal structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91

Hardness: 6
Color: Reddish-brown, tan, and cream bands
Luster: Vitreous to waxy

Identified June 29, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the process of mineralization of volcanic ash or silica-rich sediments. It typically develops in hydrothermal veins or as nodules in volcanic and sedimentary rocks. Age varies from Precambrian to modern formations.

Uses & applications

Used primarily in lapidary work, jewelry (cabochons), interior decoration, and as a semi-precious collector stone. Historically used for making tools and seals.

Geological facts

Jasper is an opaque variety of chalcedony. The name comes from the Greek word 'iaspis', meaning 'spotted stone.' It has been a sacred stone in many cultures throughout history, used for amulets and ornaments.

Field identification & locations

Identify by its hardness (will scratch glass), opaque nature, and smooth conchoidal fractures. Commonly found in riverbeds, desert regions, and near volcanic outcrops. Collectors look for unique banding or color patterns.