Refs.:
- Greg, R.P. and Lettsom, W.G. (1858) Manual of the Mineralogy of Great Britain and Ireland. 483pp., London.
- Heddle, M. F. (1901): Mineralogy of Scotland. 2 Vols., Edinburgh: David Douglas, 148 and 247 pp. (Reprinted 1923 and 1928(?)) [http://www.archive.org/details/mineralogyofscot01hedduoft; http://www.archive.org/details/mineralogyofscot02hedduoft]
- Livingstone, A. (2002): Minerals of Scotland. National Museums of Scotland Publishing Limited, Edinburgh, 212 pp.
