metamorphic
Quartzite Pebble
Quartzite
Hardness: 7 on Mohs scale. Color: Pale yellow to light tan/brownish. Luster: Dull to waxy/vitreous. Texture: Smooth, water-worn, fine-grained. Specific Gravity: ~2.65.
- Hardness
- 7 on Mohs scale
- Color
- Pale yellow to light tan/brownish
- Luster
- Dull to waxy/vitreous
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Physical properties
Hardness: 7 on Mohs scale. Color: Pale yellow to light tan/brownish. Luster: Dull to waxy/vitreous. Texture: Smooth, water-worn, fine-grained. Specific Gravity: ~2.65.
Formation & geological history
Formed when quartz-rich sandstone undergoes intense heat and pressure during regional metamorphism. This specific piece has been rounded and smoothed through river, stream, or beach erosion over time.
Uses & applications
Commonly used as decorative river rock in landscaping, aquariums, gravel pathways, or as a pocket stone for collectors. High-purity quartzite is also used in construction aggregate and manufacturing silicon.
Geological facts
Quartzite is extremely durable and resistant to chemical weathering. When struck with a hammer, it breaks across quartz grains rather than along grain boundaries, unlike sandstone.
Field identification & locations
Identified by its high hardness (scratches glass easily), smooth river-worn surface, and sugary or fused grain appearance under magnification. Commonly found in riverbeds, glacial deposits, and coastal beaches worldwide.
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