Jasper

Physical Properties

Hardness: 6.5-7.0 (Mohs scale); Color: Yellow, ochre, brown, and reddish-brown; Luster: Dull to waxy; Crystal structure: Hexagonal (trigonal) microcrystals; Cleavage: None, exhibits conchoidal fracture.

Formation & Geological History

Formed from silica-rich groundwater that precipitates in the pores of sedimentary rocks or volcanic ash. The colors are derived from iron oxide inclusions (limonite for yellow, hematite for red). Found in many geological age strata worldwide.

Uses & Applications

Commonly used in jewelry as cabochons or beads, ornamental lapidary work, and as a popular specimen for gem and mineral collectors.

Geological Facts

Jasper is derived from the Greek word 'iaspis', meaning 'spotted stone'. It is an opaque form of chalcedony. Historically, it was believed to provide protection and grounding to its bearer.

Field Identification & Locations

Identify in the field by its opacity (even on thin edges), its smooth conchoidal fracture, and the fact that it cannot be scratched by a steel knife. Commonly found in riverbeds or desert areas.

Identified on: 4/22/2026

Mode: Standard