sedimentary
Yellow Jasper
Cryptocrystalline Quartz (SiO2 with iron inclusions)
Mohs Hardness: 6.5-7. Color: Yellow to mustard-yellow with white banding. Luster: Vitreous to waxy. Crystal Structure: Hexagonal (microcrystalline). Cleavage: None (conchoidal fracture).
- Hardness
- 6
- Color
- Yellow to mustard-yellow with white banding
- Luster
- Vitreous to waxy
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Physical properties
Mohs Hardness: 6.5-7. Color: Yellow to mustard-yellow with white banding. Luster: Vitreous to waxy. Crystal Structure: Hexagonal (microcrystalline). Cleavage: None (conchoidal fracture).
Formation & geological history
Formed primarily through the infiltration of silica-rich fluids into volcanic ash or fine-grained sedimentary beds. The yellow color is caused by the presence of Goethite or other iron hydroxides. It can form in various geological ages ranging from Precambrian to recent.
Uses & applications
Used extensively in lapidary arts for cabochons, beads, and decorative carvings. It is also highly valued in metaphysical communities as a 'protection stone'.
Geological facts
Yellow Jasper was historically used by ancient civilizations as a stone of endurance and spiritual protection. Each piece is unique due to the varied distribution of mineral impurities during formation.
Field identification & locations
Check for a smooth, waxy feel and a conchoidal (shell-like) fracture pattern. It will not be scratched by a steel knife. Commonly found in riverbeds or desert regions, notably in India, Russia, and the USA.
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