mineral
Yellow Quartz Pebble
Crystalline Silicon Dioxide (SiO2)
Hardness: 7 on Mohs scale; Color: Pale yellow to tan; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific gravity: approx 2.65.
- Hardness
- 7 on Mohs scale
- Color
- Pale yellow to tan
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 on Mohs scale; Color: Pale yellow to tan; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific gravity: approx 2.65.
Formation & geological history
Formed primarily in hydrothermal veins or igneous environments, then weathered and transported by water (rivers or coastal action) into a rounded, smooth pebble shape. Iron oxide inclusions typically provide the yellow tint.
Uses & applications
Landscaping decor, aquarium gravel, tumbling for hobbyists, and occasionally used as a source for industrial silica if found in high purity.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Yellow varieties can naturally range from pale 'iron quartz' to bright Citrine, though beach pebbles are usually stained by limonite or goethite.
Field identification & locations
Identify in the field by its hardness (cannot be scratched by a steel blade) and lack of cleavage. Common in riverbeds, glacial tills, and shorelines worldwide.
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Schist
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Gypsum (variety Selenite or Alabaster)
Calcium sulfate dihydrate (CaSO4·2H2O)
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Epidote
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