metamorphic
Quartzite River Stone
Quartzite (SiO2)
Hardness: 7 on Mohs scale. Color: Grayish-green with white quartz veining. Luster: Vitreous to waxy when wet. Structure: Granular, non-foliated. Cleavage: None/Conchoidal fracture.
- Hardness
- 7 on Mohs scale
- Color
- Grayish-green with white quartz veining
- Luster
- Vitreous to waxy when wet
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Physical properties
Hardness: 7 on Mohs scale. Color: Grayish-green with white quartz veining. Luster: Vitreous to waxy when wet. Structure: Granular, non-foliated. Cleavage: None/Conchoidal fracture.
Formation & geological history
Formed from the metamorphism of quartz sandstone under high heat and pressure, often found as rounded cobbles in riverbeds due to water erosion.
Uses & applications
Used primarily as decorative landscaping stone, in construction aggregates, or as architectural stone. Tumbled pieces are popular for aquarium decor and zen gardens.
Geological facts
Quartzite is so hard and chemically resistant that it often survives long-distance transport in rivers that would wear down softer rocks like limestone.
Field identification & locations
Look for a stone that cannot be scratched by a steel knife and has a sugary, granular texture. Commonly found in glaciated regions and river basins near mountainous terrain.
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