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Harben, Peter W.; Kuzvart, Milos (1996). Industrial Minerals: A Global Geology. London: Metal Bulletin, 492pp. 1st edition. Hardback. Metal Bulletin.
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.