The Black Cuillins across Loch Scavaig, Isle of Skye, Scotland, 20th century.
The Black Cuillins across Loch Scavaig, Isle of Skye, Scotland, 20th century. The peaks of the Black Cuillin are mainly composed of gabbro, a rough black igneous rock which provides superb grip for mountaineers, and basalt, which can be slippery when wet.