sedimentary
Yellow Jasper (with Iron staining)
Silicon Dioxide (SiO2)
Hardness: 6.5-7 on Mohs scale; Color: Yellow, mustard, ochre, with reddish-brown iron oxide veins; Luster: Dull to waxy; Crystal Structure: Trigonal/Microcrystalline; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.63-2.65
- Hardness
- 6
- Color
- Yellow, mustard, ochre, with reddish-brown iron oxide veins
- Luster
- Dull to waxy
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Yellow, mustard, ochre, with reddish-brown iron oxide veins; Luster: Dull to waxy; Crystal Structure: Trigonal/Microcrystalline; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.63-2.65
Formation & geological history
Commonly forms in sedimentary environments where silica-rich fluids permeate porous rocks or volcanic ash, eventually recrystallizing into a dense, opaque microcrystalline quartz. The yellow color is primarily due to goethite or limonite (iron) inclusions.
Uses & applications
Mainly used as a gemstone in jewelry, for ornamental carvings, pocket stones, and architectural accents. Historically used for making tools due to its sharp conchoidal fracture.
Geological facts
Yellow Jasper was traditionally known as the 'Rain Bringer' in some indigenous cultures. It is an opaque variety of chalcedony and gets its name from the Greek word 'iaspis', meaning spotted stone.
Field identification & locations
Identify in the field by its opacity (even on thin edges), its hardness (will scratch glass), and its distinctive yellow to mustard color with dark dendritic or linear fractures. Found globally, including the USA, India, and Australia.
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