sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide impurities
Hardness: 6.5-7 (Mohs scale), Color: Yellow to brownish-yellow, Luster: Vitreous to waxy, Crystal Structure: Trigonal (Microcrystalline), Cleavage: None (Conchoidal fracture), Specific Gravity: 2.58-2.91
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Yellow to brownish-yellow, Luster: Vitreous to waxy, Crystal Structure: Trigonal (Microcrystalline), Cleavage: None (Conchoidal fracture), Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the infiltration of silica-rich fluids into sedimentary or volcanic material, where iron impurities color the microcrystalline quartz. Often found in hydrothermal veins and sedimentary deposits.
Uses & applications
Primarily used in jewelry (cabochons, beads), decorative carvings, lapidary arts, and as a collector's stone. In industry, it can be used for its hardness in specialized mortars/pestles.
Geological facts
Yellow jasper is often associated with the solar plexus chakra in metaphysical beliefs. The word 'jasper' originates from the Greek 'iaspis', meaning 'spotted stone.' It has been used for talismans and tools since antiquity.
Field identification & locations
Identify by its opaque quality, yellow coloration, and characteristic conchoidal fracture. Commonly found in South Africa, Brazil, India, and the USA (California and Oregon). It does not scratch with a standard steel knife.
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