metamorphic
Quartzite with Schist layers
Metamorphosed Quartz-rich Rock (Mixed Schist/Quartzite)
Hardness: 6.5-7 (Mohs); Color: Tan, beige, grey; Luster: Dull to vitreous; Structure: Foliated with protruding quartz ribs; Cleavage: Poor; Specific Gravity: ~2.65.
- Hardness
- 6
- Color
- Tan, beige, grey
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Tan, beige, grey; Luster: Dull to vitreous; Structure: Foliated with protruding quartz ribs; Cleavage: Poor; Specific Gravity: ~2.65.
Formation & geological history
Formed through regional metamorphism of sandstone and shale under high temperature and pressure. The ribbed appearance is due to differential weathering where harder quartz layers resist erosion better than softer micaceous layers.
Uses & applications
Used primarily as construction aggregate, decorative garden stone, and riprap for erosion control. Large boulders are used in landscaping.
Geological facts
The protruding ridges are often called 'ribbed rock' or 'pressure ridges.' It is a testament to the immense pressures within the Earth's crust that can fold and compress solid rock into these shapes.
Field identification & locations
Identified by high hardness (scratches glass) and distinct layering. Common in metamorphic belts and riverbeds where water has smoothed the surface. Collectors look for unique folding patterns.
