Black Slate Riven From charcoal grey to black in colour black slate is striking both inside and out. This beautiful riven slate has a slightly undulating surface like handmade paper. Soft to the touch and exquisitely detailed this slate loves bright bold lighting. Sizes and Prices Available : £ 14.60 / m² + vat (Usually £16 / m² ) £ 16.25 / m² + vat  (Usually £17.75 / m² ) £ 17.10 / m² + vat  (Usually £17.75 / m² ) £ 22.90 / m² + vat (Usually £24 / m² ) 1cm thick at £ 24.80 / m² + vat (Usually £28 / m² ) 1.5 cm thick at £ 30.85 / m² + vat (Usually £36 / m² )