metamorphic
Slate
Slate (Foliated Metamorphic Rock)
Hardness: 2.5-4 on Mohs scale. Color: Grey to dark grey. Luster: Dull to earthy. Texture: Fine-grained with strong slaty cleavage, allowing it to break into flat, thin sheets.
- Hardness
- 2
- Color
- Grey to dark grey
- Luster
- Dull to earthy
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Physical properties
Hardness: 2.5-4 on Mohs scale. Color: Grey to dark grey. Luster: Dull to earthy. Texture: Fine-grained with strong slaty cleavage, allowing it to break into flat, thin sheets.
Formation & geological history
Formed through low-grade regional metamorphism of shale, mudstone, or siltstone under low temperatures and pressures.
Uses & applications
Used for roofing tiles, flooring, electrical insulation, billiard tables, blackboards, and decorative stone work.
Geological facts
Slate is extremely durable and weather-resistant, which is why slate roofs can last over a hundred years.
Field identification & locations
Identified in the field by its distinct planar cleavage, dull surface, ringing sound when tapped, and fine grain size. Common in ancient mountain belts.
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