sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with Goethite/Iron Oxide inclusions
Hardness: 6.5-7 on Mohs scale; Color: Mustard yellow, golden brown; Luster: Vitreous to waxy; Crystal Structure: Hexagonal (Microcrystalline); Cleavage: None; Opaque.
- Hardness
- 6
- Color
- Mustard yellow, golden brown
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Mustard yellow, golden brown; Luster: Vitreous to waxy; Crystal Structure: Hexagonal (Microcrystalline); Cleavage: None; Opaque.
Formation & geological history
Formed through the infiltration of silica-rich fluids into sediment or volcanic ash, combined with iron impurities that provide the yellow pigmentation. Often found in hydrothermal veins or as primary deposits in volcanic rock environments.
Uses & applications
Primarily used for lapidary work, including cabochons, beads, and tumbled stones for jewelry and decorative objects. Highly valued in metaphysical circles as a nurturing stone.
Geological facts
Jasper is an impure variety of silica. The name comes from the Greek word 'iaspis', meaning 'spotted stone.' Yellow jasper can sometimes be mistaken for Yellow Calcite, but it is much harder and will not react to acid.
Field identification & locations
Identify by its opaque nature (unlike citrine) and its ability to scratch glass. Found globally, with notable deposits in India, Russia, Brazil, and the USA. Collectors look for uniform color or interesting patterns.
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