Slate, Metamorphic Rock, Sedimentary Origin, Uses in Construction

Slate, fine-grained, clayey metamorphic rock that cleaves, or splits, readily into thin slabs having great tensile strength and durability; some other rocks that occur in thin beds are improperly called slate because they can be used for roofing and similar purposes. True slates do not, as a rule

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Slate: Metamorphic Rock - Pictures, Definition & More

Slate