sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 (Mohs scale); Color: Mustard yellow to golden brown; Luster: Vitreous to waxy; Structure: Microcrystalline; Cleavage: None (conchoidal fracture); SG: 2.6-2.9.
- Hardness
- 6
- Color
- Mustard yellow to golden brown
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Mustard yellow to golden brown; Luster: Vitreous to waxy; Structure: Microcrystalline; Cleavage: None (conchoidal fracture); SG: 2.6-2.9.
Formation & geological history
Formed when silica-rich fluids permeate through sedimentary rocks or volcanic ash, depositing microcrystalline quartz. Variations in iron content create the yellow-to-brown banding.
Uses & applications
Commonly used in lapidary work for cabochons, beads, decorative carvings, and as a pocket stone or tumbled collectible.
Geological facts
Yellow Jasper has been used by various cultures throughout history as a stone of protection and discernment. The banding is often caused by rhythmic precipitation of iron oxides during lithification.
Field identification & locations
Look for a smooth, matte to waxy surface that cannot be scratched by a steel knife. It is frequently found in riverbeds and coastal areas worldwide, particularly in the western USA, Brazil, and India.
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