sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with Goethite/Iron oxide impurities
Hardness: 6.5-7 on Mohs scale. Color: Mustard yellow to brownish-yellow. Luster: Vitreous to waxy. Structure: Microcrystalline quartz (trigonal). Cleavage: None. Specific Gravity: 2.58-2.91.
- Hardness
- 6
- Color
- Mustard yellow to brownish-yellow
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 on Mohs scale. Color: Mustard yellow to brownish-yellow. Luster: Vitreous to waxy. Structure: Microcrystalline quartz (trigonal). Cleavage: None. Specific Gravity: 2.58-2.91.
Formation & geological history
Formed through the deposition of silica from hydrothermal solutions or in sedimentary environments where volcanic ash or fine sediment is petrified. Its color comes from high iron content.
Uses & applications
Used primarily in jewelry as cabochons or beads, for decorative carvings, as tumbled stones for collecting, and in metaphysical practices.
Geological facts
Jasper is an opaque variety of chalcedony. Yellow jasper was historically used by travelers as a protective stone. It is often found as smooth river pebbles or in large veins.
Field identification & locations
Identify by its complete opacity (it does not let light through even at the edges), smooth waxy feel when polished, and characteristic ochre-yellow hue. Often found in South Africa, USA, and Madagascar.
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