Cairngorm

Cairngorm (so called from the central peak of the Grampian Mountains, among which it is found), yellowish brown rock-crystal, coloured by a slight trace of iron oxide. Its colour varies from a light wine colour to smoky, or even black (called Morion). It is also found in Cornwall, Brazil, India, and elsewhere, and is akin to the "Rauchtopaz," or smoke topaz, of which enormous masses have been found in Switzerland. It is much used in Scottish jewellery.