sedimentary
Yellow Jasper
Silicon Dioxide with Hydrous Iron Oxide (SiO2 + FeO(OH))
Hardness: 6.5-7.0 (Mohs); Color: Yellow to brownish-yellow; Luster: Vitreous to waxy; Structure: Microcrystalline/Cryptocrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Yellow to brownish-yellow
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7.0 (Mohs); Color: Yellow to brownish-yellow; Luster: Vitreous to waxy; Structure: Microcrystalline/Cryptocrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
Formation & geological history
Forms through the hydrothermal or sedimentary deposition of silica in environments containing iron oxides (limonite/goethite), which provide the yellow pigment. This specimen appears water-worn from a river or beach environment.
Uses & applications
Commonly used in lapidary work for cabochons, beads, and tumbled stones. Also used in decor and as a healing stone in metaphysical practices.
Geological facts
Jasper is an opaque variety of chalcedony. The name 'Jasper' is derived from the Greek word 'iaspis', meaning 'spotted stone'. In ancient times, it was believed to provide protection and promote inner strength.
Field identification & locations
Identified in the field by its opacity (even on thin edges), its yellow pigment, and its extreme hardness (cannot be scratched by a steel pocket knife). Found globally in sedimentary deposits and volcanic ash beds.
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