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Maitre, R. W. Le, Streckeisen, A., Zanettin, B., Bas, M. J. Le, Bonin, B., Bateman, P., 2002: Igneous Rocks: A Classification and
Glossary of Terms (Recommendations of the International Union of Geological Sciences Subcommission on the Systematics of Igneous Rocks). Cambridge University Press, 252
65:). Due to the fact that chemical analyzes are not always available, especially during the fieldwork, classification based on the mineral (modal) composition is more often used (dividing the igneous rocks into
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The term "silicic", widely used in South
America, has wider meaning, however, is often used as broadly synonymous with "acidic".
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Gill, R., 2010: Igneous rocks and processes: a practical guide. John Wiley & Sons, Chichester, ISBN 978-1-4443-3065-6 p. 8
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Mannell, F. P., 1913: A manual of petrology. Chapmann & Hall, Covent Garden, p. 118
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evolved during the 19th century. It was based on the idea that high silica rocks are
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content. Rocks described as acidic usually contain more than 20% of free
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167:. Department of Geological Sciences, San Diego State University
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Terms describing composition of igneous rocks as acidic or
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and on the contrary the rocks with low silica content are
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159:(2000).
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