sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide impurities
Hardness: 6.5-7 (Mohs); Color: Mustard yellow to brownish-yellow; Luster: Vitreous to waxy (when polished); Structure: Microcrystalline/Cryptocrystalline; Cleavage: None (Conchoidal fracture)
- Hardness
- 6
- Color
- Mustard yellow to brownish-yellow
- Luster
- Vitreous to waxy (when polished)
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Mustard yellow to brownish-yellow; Luster: Vitreous to waxy (when polished); Structure: Microcrystalline/Cryptocrystalline; Cleavage: None (Conchoidal fracture)
Formation & geological history
Formed from the deposition of silica-rich fluids in volcanic or sedimentary environments, where iron inclusions provide the yellow pigmentation during the consolidation process.
Uses & applications
Primarily used as a gemstone for jewelry, lapidary arts (tumbled stones, cabochons), and as a collector's mineral believed by some to have metaphysical healing properties.
Geological facts
Jasper is an opaque variety of chalcedony. The name comes from the Greek word 'iaspis', meaning 'spotted stone'. It was highly favored in the ancient world for seals and amulets.
Field identification & locations
Identify by its opacity (it does not transmit light unlike agate), smooth waxy feel when polished, and characteristic yellow/ochre earthy tones. Found globally, notably in India, Russia, and the USA.
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