metamorphic
Yellow Quartzite (River Pebble)
Quartzite (mainly SiO2)
Hardness: 7 (Mohs scale); Color: Yellow/Creamy; Luster: Vitreous to waxy (when polished); Crystal structure: Trigonal (microcrystalline); Cleavage: None; Specific gravity: 2.63-2.65
- Hardness
- 7 (Mohs scale)
- Color
- Yellow/Creamy
- Luster
- Vitreous to waxy (when polished)
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Physical properties
Hardness: 7 (Mohs scale); Color: Yellow/Creamy; Luster: Vitreous to waxy (when polished); Crystal structure: Trigonal (microcrystalline); Cleavage: None; Specific gravity: 2.63-2.65
Formation & geological history
Formed from the metamorphism of quartz-rich sandstone. High heat and pressure Recrystallize quartz grains into a dense, interlocking matrix. This specimen has been rounded by fluvial action (river erosion).
Uses & applications
Used as decorative garden stones, in landscaping, aquarium decor, and sometimes as low-cost gemstones for tumbling or metaphysical practices.
Geological facts
Quartzite is so tough that it often outlasts the original rock beds and ends up as pebbles in rivers or beaches. The yellow coloration is typically caused by minute inclusions of iron oxides like goethite or limonite.
Field identification & locations
Identify by its ability to scratch glass and lack of reaction to acid. It often appears 'sugary' inside if broken, but smooth and translucent on the surface when water-worn. Common in riverbeds globally.
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