sedimentary
Yellow Jasper
Silicon dioxide (SiO2) with iron oxide impurities
Hardness: 6.5-7 (Mohs scale); Color: Mustard yellow, tan, or ochre; Luster: Vitreous to waxy; Structure: Microcrystalline/Cryptocrystalline quartz; Cleavage: None, exhibits conchoidal fracture.
- Hardness
- 6
- Color
- Mustard yellow, tan, or ochre
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Mustard yellow, tan, or ochre; Luster: Vitreous to waxy; Structure: Microcrystalline/Cryptocrystalline quartz; Cleavage: None, exhibits conchoidal fracture.
Formation & geological history
Formed through the deposition of silica from volcanic ash or water in sedimentary environments. Its yellow color is primarily due to the presence of goethite or other iron oxides. It can form in various geological ages ranging from the Precambrian to recent times.
Uses & applications
Primarily used as a decorative stone, in jewelry (lapidary), and for metaphysical or collecting purposes. Industrially, it has been used for abrasives in the past.
Geological facts
Jasper is an opaque variety of chalcedony. The name comes from the Greek word 'iaspis', meaning 'spotted stone'. It was one of the favorite gemstones in antiquity and is mentioned in the Bible as one of the stones in the High Priest's breastplate.
Field identification & locations
Identify by its opaque quality, smooth waxy feel when polished, and its inability to be scratched by a steel knife. It is common in riverbeds and desert regions worldwide, notably in India, Brazil, and the USA.
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