metamorphic
Quartzite Pebble
Quartzite (SiO2)
Hardness: 7 on Mohs scale. Color: Light brown to tan with hints of pink. Luster: Vitreous to dull. Crystal structure: Hexagonal (microcrystalline). Cleavage: None (conchoidal fracture). Specific gravity: 2.6-2.7.
- Hardness
- 7 on Mohs scale
- Color
- Light brown to tan with hints of pink
- Luster
- Vitreous to dull
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Physical properties
Hardness: 7 on Mohs scale. Color: Light brown to tan with hints of pink. Luster: Vitreous to dull. Crystal structure: Hexagonal (microcrystalline). Cleavage: None (conchoidal fracture). Specific gravity: 2.6-2.7.
Formation & geological history
Formed through the regional metamorphism of sandstone under high heat and pressure, causing quartz grains to recrystallize and fuse. This specimen shows significant rounding due to fluvial or coastal water erosion.
Uses & applications
Used primarily as decorative gravel in landscaping, as a construction aggregate, for railroad ballast, and occasionally for crafting or stone tumbling.
Geological facts
Quartzite is so tough that it often survives intense weathering that destroys surrounding rocks. In certain cultures, smooth quartzite pebbles were used as primitive tools or sling stones due to their density and durability.
Field identification & locations
Identify by its ability to scratch glass and the lack of visible pore space. It will not fizz with acid (unlike limestone) and breaks across the sand grains rather than around them. Commonly found in riverbeds and on beaches.
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