Jasper

Physical Properties

Hardness: 6.5-7 (Mohs); Color: tan to reddish-brown; Luster: vitreous to waxy; Crystal structure: Microcrystalline/Cryptocrystalline; Conchoidal fracture

Formation & Geological History

Formed through the infiltration of silica-rich fluids into volcanic ash or fine-grained sediments, typically undergoing intense consolidation over millions of years.

Uses & Applications

Commonly used in lapidary work, jewelry (cabochons), as decorative stones, and in crystal healing practices.

Geological Facts

Jasper is an opaque variety of chalcedony. The name comes from the Greek word 'iaspis', meaning spotted stone, referring to its multi-colored or mottled appearance.

Field Identification & Locations

Identify by its extreme hardness (cannot be scratched by a steel knife) and waxy feel when polished. Widely found in riverbeds and coastal regions globally.

Identified on: 4/22/2026

Mode: Standard