sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 (Mohs); Color: Mustard yellow to brownish-yellow; Luster: Dull to vitreous/waxy; Crystal Structure: Microcrystalline/Trigonal (Cryptocrystalline); Cleavage: None (Conchoidal fracture); Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Mustard yellow to brownish-yellow
- Luster
- Dull to vitreous/waxy
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Mustard yellow to brownish-yellow; Luster: Dull to vitreous/waxy; Crystal Structure: Microcrystalline/Trigonal (Cryptocrystalline); Cleavage: None (Conchoidal fracture); Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the infiltration of silica-rich fluids into sediment or volcanic ash, often containing iron hydroxides (goethite) that impart the yellow color. It typically forms in hydrothermal or sedimentary environments.
Uses & applications
Primarily used as a semi-precious gemstone in jewelry (cabochons, beads), decorative ornaments, and by practitioners of crystal healing for grounding and protection.
Geological facts
Jasper is an opaque variety of chalcedony. The name comes from the Greek word 'iaspis', meaning 'spotted stone'. In ancient times, it was sometimes called 'rain-bringer'.
Field identification & locations
Identify by its hardness (scratches glass), waxy luster, and opaque yellow coloring. It is commonly found in riverbeds, deserts, and volcanic regions globally, including substantial deposits in India, Russia, and the USA.
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