metamorphic
Slate
Slate (Foliated Metamorphic Rock)
Hardness: 2.5-4 Mohs; Color: Gray, black, or earthy tones; Luster: Dull to satiny; Structure: Foliated (slaty cleavage); Cleavage: Perfect planar cleavage.
- Hardness
- 2
- Color
- Gray, black, or earthy tones
- Luster
- Dull to satiny
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Physical properties
Hardness: 2.5-4 Mohs; Color: Gray, black, or earthy tones; Luster: Dull to satiny; Structure: Foliated (slaty cleavage); Cleavage: Perfect planar cleavage.
Formation & geological history
Formed through low-grade metamorphism of shale or mudstone under relatively low pressure and temperature conditions. It is typically associated with regional metamorphism during mountain-building events.
Uses & applications
Used for roofing shingles, flooring tiles, billiard table tops, blackboards, and garden landscaping.
Geological facts
Slate is unique because it can be split into very thin, flat sheets. Some of the world's most famous slate comes from Wales, UK, and the Slate Valley of Vermont/New York.
Field identification & locations
Identified in the field by its ability to split into thin sheets and its distinct 'clink' sound when struck. Found in mountainous or formerly mountainous regions globally.
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