applied to igneous rock and magma rich in silica, where silica forms more than 2/3 of the mass or consisting at least 65% of the rock.
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© 2009 Springer-Verlag Berlin Heidelberg New York
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(2009). acidic. In: Manutchehr-Danai, M. (eds) Dictionary of Gems and Gemology. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-72816-0_140
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