The Nuttall Encyclopedia
A yellowish-brown variety of rock-crystal, so called from being found, among other places, on one of the Scottish Grampians, in Aberdeenshire, so named.
Wood, James, ed. Entry for 'Cairngorm'. The Nuttall Encyclopedia. https://www.studylight.org/encyclopedias/eng/nut/c/cairngorm.html. Frederick Warne & Co Ltd. London. 1900.