metamorphic
Slate
Low-grade Metamorphic Rock
Hardness: 2.5-4; Color: Grey, green, or blue-grey; Luster: Dull to satiny; Crystal Structure: Microcrystalline with slaty cleavage; Physical property: Splits into thin flat sheets.
- Hardness
- 2
- Color
- Grey, green, or blue-grey
- Luster
- Dull to satiny
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Physical properties
Hardness: 2.5-4; Color: Grey, green, or blue-grey; Luster: Dull to satiny; Crystal Structure: Microcrystalline with slaty cleavage; Physical property: Splits into thin flat sheets.
Formation & geological history
Formed through low-grade regional metamorphism of shale or mudstone under low pressure and temperature conditions. It is typically found in fold mountain belts.
Uses & applications
Widely used in the construction industry for roofing, flooring, and flagstones due to its durability and cleavage. Also used for billiard tables and blackboards.
Geological facts
Slate is unique because it can be split into very thin sheets while maintaining its strength. It has been used for roofing for centuries, and some slate roofs can last over 100 years.
Field identification & locations
Identify in the field by its fine-grained texture and ability to split into flat, parallel layers. It is commonly found in areas such as Wales, Pennsylvania, and Vermont.
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