sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron hydroxides
Hardness: 6.5-7 (Mohs); Color: Mustard yellow to golden brown; Luster: Dull to waxy; Structure: Microcrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Mustard yellow to golden brown
- Luster
- Dull to waxy
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Mustard yellow to golden brown; Luster: Dull to waxy; Structure: Microcrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the accumulation of silica-rich fluids in volcanic ash or sedimentary rocks. The yellow hue is primarily due to goethite or other iron hydroxide inclusions. Aging depends on the local geological deposit, often millions of years old.
Uses & applications
Commonly used in lapidary work for cabochons, beads, and ornamental carvings. Also popular in the metaphysical community and as a landscaping stone.
Geological facts
Jasper is an opaque variety of chalcedony. The name 'Jasper' is derived from the Greek word 'iaspis', meaning spotted stone, though yellow jasper is often more monochromatic than other varieties.
Field identification & locations
Identify by its opacity (does not let light through even at the edges), smooth water-worn texture on beaches, and high hardness (will scratch glass). Commonly found in riverbeds and coastal shorelines globally.
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