Very slippery when wet

This is Blaven (Bla Bheinn) which is an outrider of the Cuillins on the Isle Of Skye. 
The peaks of the Black Cuillin are mainly composed of gabbro, a very rough black igneous rock which provides a superb grip for mountaineers, and basalt, which can be very slippery when wet. The summits of the Cuillin are bare rock, jagged in outline and with steep cliffs and deep cut corries and gullies. Twelve Black Cuillin peaks are listed as Munros, though one of them, Blaven, is part of a group of outliers separated from the main ridge by Glen Sligachan.