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The terminology of a slate

Slate

Slate is a compact and fine-grained metamorphic rock. Due to its excellent fracture cleavage it can be split into thin plates and slabs. The original material for slate is commonly shale.

 

Roofing slate

A rock which can be used for roofs and façades and which comprises mainly phyllosilicates (micas) and shows a penetrative fracture cleavage.

 

Slate ribbon

A ribbon is a structure on the cleavage surface of a slate, consisting of multicoloured stripes which can be straight, wavy or crumpled and generally traces the bedding.

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