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2. Tröger, W. E. (1967). Optische Bestimmung der gesteinsbildenden Minerale, ed. H. U. Bambauer, F. Taborsky and H. D. Trochim, 2 vols. Schweizerbart, Stuttgart
3. Deer, W. A., Howie, R. A. and Zussman, J. (1992). An Introduction to the Rock-Forming Minerals, 2nd edn. Longman, Harlow, Essex, 696pp
4. Deer, W. A., Howie, R. A. and Zussman, J. (1962). Rock-Forming Minerals. Longman, London, 5 vols
5. Deer, W. A., Howie, R. A. and Zussman, J. (1982–2002). Rock-Forming Minerals, 2nd edn. The Geological Society, London, 10 vols. (six have appeared)