Yellow Jasper

Physical Properties

Hardness: 6.5-7 (Mohs scale); Color: Mustard yellow, tan, golden brown with dark swirls; Luster: Dull to vitreous/waxy; Crystal Structure: Trigonal (Microcrystalline quartz); Cleavage: None; Specific Gravity: 2.58-2.91

Formation & Geological History

Formed via the deposition of silica from water-rich environments, often in volcanic or sedimentary beds where iron impurities like goethite create the yellow banding. It is a microcrystalline variety of quartz.

Uses & Applications

Commonly used for lapidary work, cabochons, metaphysical practices, home decor, and historically for stone tools and carvings.

Geological Facts

Jasper was a favorite gem in the ancient world; its name can be traced back to Arabic, Persian, Greek, and Latin. Yellow jasper is often called a 'nurturing stone' in folklore.

Field Identification & Locations

Identify by its opaque nature (unlike agate), conchoidal fracture patterns, and its inability to be scratched by a steel knife. Frequently found in riverbeds and coastal regions globally, particularly in areas with volcanic history.

Identified on: 4/28/2026

Mode: Standard