sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron inclusions
Hardness: 6.5-7 on Mohs scale; Color: Mustard yellow to golden brown; Luster: Dull to vitreous; Crystal Structure: Microcrystalline trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.6-2.7
- Hardness
- 6
- Color
- Mustard yellow to golden brown
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Mustard yellow to golden brown; Luster: Dull to vitreous; Crystal Structure: Microcrystalline trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.6-2.7
Formation & geological history
Formed primarily as a sedimentary rock when silica-rich fluids permeate through volcanic ash or other sediments. The yellow coloration is caused by the presence of iron oxide (goethite) inclusions.
Uses & applications
Used extensively in jewelry making for cabochons and beads, as well as for decorative items, polished river stones, and metaphysical lapidary work.
Geological facts
Yellow Jasper has been used since antiquity; it was historically believed to provide protection and support during travel. It is a variety of chalcedony.
Field identification & locations
Identify by its smooth touch, lack of visible grain, and opaque mustard-yellow patches. It is commonly found in river beds, beaches, and desert environments worldwide.
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