sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) - variety Jasper
Hardness: 6.5-7 (Mohs scale); Color: Ochre yellow to mustard; Luster: Dull to waxy; Structure: Microcrystalline/Cryptocrystalline; Cleavage: None; Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Ochre yellow to mustard
- Luster
- Dull to waxy
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Ochre yellow to mustard; Luster: Dull to waxy; Structure: Microcrystalline/Cryptocrystalline; Cleavage: None; Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the accumulation of silica from either volcanic ash or hydrothermal sources circulating through sediment. Its yellow color comes from iron hydroxide inclusions like goethite.
Uses & applications
Primarily used as a lapidary material for cabochons, beads, carvings, and as a decorative landscaping stone.
Geological facts
Jasper is an opaque variety of chalcedony. The name comes from the Greek word 'iaspis', meaning spotted stone, though yellow jasper is often more uniform in color than other types.
Field identification & locations
Identify by its opacity (it does not let light through, unlike agate), smooth waxy feel when wet, and inability to be scratched by a steel knife. Commonly found in riverbeds and desert environments globally.
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