sedimentary
Yellow Quartz (Citrine/Yellow Jasper Pebble)
Silicon Dioxide (SiO2)
Hardness: 7 on Mohs scale; Color: Pale yellow to honey-orange; Luster: Vitreous to waxy (when water-worn); Crystal structure: Hexagonal/Trigonal; Cleavage: None; Specific gravity: 2.65.
- Hardness
- 7 on Mohs scale
- Color
- Pale yellow to honey-orange
- Luster
- Vitreous to waxy (when water-worn)
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Physical properties
Hardness: 7 on Mohs scale; Color: Pale yellow to honey-orange; Luster: Vitreous to waxy (when water-worn); Crystal structure: Hexagonal/Trigonal; Cleavage: None; Specific gravity: 2.65.
Formation & geological history
Formed from silica-rich fluids in hydrothermal veins or as crystals in igneous rocks, subsequently eroded and rounded by water transport in rivers or beaches. Yellow coloration often comes from trace amounts of iron.
Uses & applications
Used in lapidary work for cabochons, metaphysical crystals, jewelry, and as decorative garden or aquarium stones.
Geological facts
Natural yellow quartz is often confused with heat-treated amethyst. When found as a river pebble, it is often called a 'lemon stone' or 'river gold'.
Field identification & locations
Identify by its hardness (will scratch glass) and lack of cleavage. Common in alluvial deposits, riverbeds, and coastal regions globally.
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