metamorphic
Quartzite Pebble
Quartzite (SiO2)
Hardness: 7 (Mohs scale), Color: tan, grey, and white with translucent areas, Luster: vitreous to dull, Structure: granular, non-foliated. Specific gravity: 2.6-2.7. Highly resistant to physical weathering.
- Luster
- vitreous to dull, Structure: granular, non-foliated
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Physical properties
Hardness: 7 (Mohs scale), Color: tan, grey, and white with translucent areas, Luster: vitreous to dull, Structure: granular, non-foliated. Specific gravity: 2.6-2.7. Highly resistant to physical weathering.
Formation & geological history
Formed from the metamorphism of quartz sandstone under high heat and pressure. The original quartz grains recrystallize into a dense interlocking mosaic. Found in ancient mountain belts and glacial till.
Uses & applications
Industrial uses include glass manufacturing, stone surfacing, and as a durable construction aggregate or railroad ballast.
Geological facts
Quartzite is typically harder and tougher than the parent sandstone. In some cases, it can be so hard that when it breaks, it fractures through the quartz grains rather than along the boundaries between them.
Field identification & locations
Identified by its extreme hardness (cannot be scratched by steel) and lack of reaction to acid. Often found as rounded pebbles in stream beds or coastal areas due to its durability. Common worldwide in metamorphic terrains.
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