Offerdal

Offerdal slate is a part of the Offerdal highland region and has a fine-banded structure or cleavability. This cleavability can be characterised by clear quartz and feldspar-rich bands together with a cleavage plane rich in mica. The rock’s cleavability makes it possible to split the slates to a thickness of just 5 mm.
The surface is rippled and grey in colour. Polished surfaces vary between grey and green. Offerdal slate is hard and is a quite unique building stone. It occurs in an approx. 10m thick zone over a broad area of the Offerdal region.
Quarrying activities are concentrated in the north-west area of Krokoms Municipality, Jämtland County, in Sweden.