sedimentary

Yellow Jasper

Silicon Dioxide with Limonite/Goethite inclusions (SiO2)

AI-generated identification · may be incorrect

Hardness: 6.5-7.0 (Mohs), Color: Yellow to brownish-yellow/ochre, Luster: Dull to waxy when unpolished, Crystal Structure: Microcrystalline quartz/Cryptocrystalline (Hexagonal), Cleavage: None, Fracture: Conchoidal.

Hardness: 6

Identified June 9, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed as silica-rich fluids permeate through sedimentary or volcanic rock layers, depositing microcrystalline quartz. The yellow color comes from iron oxide (limonite or goethite) inclusions during the formation process, often in shallow marine or hydrothermal environments.

Uses & applications

Primarily used for lapidary work, jewelry making (cabochons, beads), decorative ornaments, and as a popular specimen for crystal healing and mineral collectors.

Geological facts

Yellow Jasper was historically used by ancient civilizations as a stone of protection and was often referred to as 'The Rain Bringer' in some Native American traditions. It is a variety of chalcedony.

Field identification & locations

Identify by its hardness (will scratch glass), opaque nature, and smooth, water-worn texture if found near riverbeds. Common in arid environments or river deposits. Collectors should look for unique banding or patterns.