Jasper

Physical Properties

Hardness: 6.5 - 7 (Mohs); Color: Brown/Yellow-brown; Luster: Dull/Waxy; Crystal Structure: Microcrystalline; Cleavage: None; Specific Gravity: 2.58 - 2.91

Formation & Geological History

Formed from silica-rich sediment deposits and groundwater infiltration in volcanic or sedimentary environments. Most specimens are millions of years old, often found in association with ancient volcanic activity.

Uses & Applications

Commonly used for lapidary work, jewelry (beads/cabochons), or as a collector's stone. In history, it was used for making tools and seals.

Geological Facts

Jasper is an opaque variety of chalcedony. Its color comes from mineral impurities like iron oxides; while red is famous, 'Yellow Jasper' or 'Brown Jasper' like this specimen is very common.

Field Identification & Locations

Identify by its opacity (does not transmit light), smooth waxy feel, and conchoid fracture (breaks like glass). Commonly found in riverbeds, deserts, and volcanic regions.

Identified on: 4/15/2026

Mode: Standard