Yellow Jasper

Physical Properties

Hardness: 6.5–7 on Mohs scale; Color: Mustard yellow, golden brown; Luster: Vitreous/Waxy; Crystal Structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.58–2.91

Formation & Geological History

Formed through the deposition of silica from hydrothermal solutions or volcanic ash in sedimentary environments. Its yellow color is derived from iron (goethite) inclusions. It can date back to various geological eras depending on the formation site.

Uses & Applications

Used primarily in lapidary arts for cabochons, beads, and tumbled stones. Often used in jewelry, decorative carvings, and as a 'healing stone' in metaphysical practices.

Geological Facts

Jasper is an opaque variety of chalcedony. The name 'Jasper' is derived from the Greek word 'iaspis', meaning 'spotted stone'. In ancient times, yellow jasper was believed to protect travelers and provide spiritual grounding.

Field Identification & Locations

Identify by its opacity (even on thin edges), smooth waxy feel when polished, and high hardness (cannot be scratched by a steel knife). Commonly found in riverbeds or coastal areas in India, Russia, Brazil, and the USA (California and Oregon).

Identified on: 4/24/2026

Mode: Standard