sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron hydroxides
Hardness: 6.5-7 (Mohs scale); Color: Yellow to brownish-yellow; Luster: Vitreous to waxy; Crystal structure: Hexagonal (cryptocrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.6-2.9
- Hardness
- 6
- Color
- Yellow to brownish-yellow
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Yellow to brownish-yellow; Luster: Vitreous to waxy; Crystal structure: Hexagonal (cryptocrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.6-2.9
Formation & geological history
Formed through the accumulation of fine-grained volcanic ash or silica-rich seafloor sediments that undergo silicification and hardening over millions of years, often in oxidized environments that create the yellow hue.
Uses & applications
Used primarily as a decorative gemstone, for lapidary work (cabochons and beads), in meditation practices, and as a landscaping stone.
Geological facts
Yellow Jasper was traditionally used as a stone of protection and discernment. It gets its distinctive yellow color from inclusions of goethite or other iron oxides.
Field identification & locations
Identify in the field by its opacity (unlike translucent citrine), its high hardness (it will scratch glass), and its distinctive smooth, waxy surface when wet or polished. Commonly found in riverbeds and arid regions.
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