sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with Iron inclusions

AI-generated identification · may be incorrect

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

Hardness: 6
Color: Mustard yellow to brownish-yellow
Luster: Vitreous to waxy

Identified April 8, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the accumulation of fine-grained silica-rich sediments or volcanic ash. The yellow coloration is primarily due to the presence of goethite or iron oxide. It can be found in sedimentary beds or as nodules in volcanic rocks.

Uses & applications

Commonly used in jewelry (beads, cabochons), ornamental carvings, and 'healing' stones. In history, it was used for seals and decorative inlay.

Geological facts

Jasper is an opaque variety of chalcedony. The name comes from the Greek word 'iaspis', meaning 'spotted stone'. Yellow jasper specifically was historically associated with protection during travel.

Field identification & locations

Identify in the field by its opaque nature, smooth waxy texture when handled, and the characteristic conchoidal fracture if broken. It is often found as river-worn pebbles in regions with volcanic or sedimentary history.