Image: Classification extrusive rocks EN
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Description: IUGS classification of aphanitic igneous rocks according to their relative alkali (Na2O + K2O) and silica (SiO2) weight contents. Blue area is roughly where alkaline rocks plot; yellow area where subalkaline rocks plot. Original source:
.mw-parser-output .smallcaps{font-variant:small-caps}Le Maitre, R.W. (ed.); 1989: A classification of igneous rocks and glossary of terms, Blackwell Science, Oxford.
Author: Woudloper
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