Yellow Jasper

Physical Properties

Hardness: 6.5-7 (Mohs); Color: Mustard yellow to brownish-yellow; Luster: Vitreous to waxy; Crystal structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91

Formation & Geological History

Formed through the infiltration of silica-rich fluids into volcanic ash or fine-grained sediments, typically in marine or hydrothermal environments. Its yellow color comes from the presence of goethite or limonite.

Uses & Applications

Used primarily for lapidary work, jewelry (cabochons and beads), ornamental carvings, and as a popular specimen for crystal healing collectors.

Geological Facts

Jasper is an opaque variety of chalcedony. Historically known as a 'nurturing stone,' yellow jasper was highly valued in ancient civilizations for its supposed protective qualities during travel.

Field Identification & Locations

Identify in the field by its smooth, waxy texture, opacity (it does not transmit light even at the edges), and extreme hardness—it will easily scratch glass. Commonly found in river beds or desert wash areas, especially in regions like Madagascar or the Western USA.

Identified on: 5/20/2026

Mode: Standard