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Harben, Peter W.; Kuzvart, Milos (1996). Industrial Minerals: A Global Geology. London: Metal Bulletin, 492pp. 1st edition. Hardback. Metal Bulletin.
Rankin, Daniel J. (1901). Prospecting for Gold; a Handbook of Practical information and Hints for Prospectors Based on Personal Experience. London:. Crosby Lockwood.
Watson, John (1911). British and Foreign Building Stones. A Descriptive Catalogue of the Specimens in the Sedgwick Museum, Cambridge. Cambridge University Press, 483pp. 1st. Cambridge University Press.
Gray, P.M.J. and Bowyer, G.J. et al (eds) (1990). Sulphide deposits―their origin and processing. London: Institution of Mining and Metallurgy, 310pp. 1st. Institute of Mining and Metallurgy.
Webster, R. (1962). Gems; Their Sources, Descriptions and Identification. London: Butterworths. Butterworth.