sedimentary
Yellow Jasper
Silicon Dioxide with Limonite/Goethite inclusions (SiO2)
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
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Physical properties
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.
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.
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