OR/14/063 Appendix 3 - Chemical classification and nomenclature of fine-grained crystalline rocks

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Whitbread, K, Ellen, R, Callaghan, E, Gordon, J E, and Arkley, S. 2014. East Lothian geodiversity audit. British Geological Survey Internal Report, OR/14/063.

Total alkali silica (TAS) diagram (sourced from BGS Rock Classification Scheme, Volume 1, Classification of igneous rocks). The scheme names igneous crystalline rocks based on their silica to sodium/potassium content.