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Description
English: 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:

  • Le Maitre, R.W. (ed.); 1989: A classification of igneous rocks and glossary of terms, Blackwell Science, Oxford.
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en:TAS classification

Captions

Classification of aphanitic extrusive igneous rocks

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May 2010

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0bfd6cc5e8640862469914187dbe74adefe7332d

47,087 byte

520 pixel

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Date/TimeThumbnailDimensionsUserComment
current19:12, 12 May 2010Thumbnail for version as of 19:12, 12 May 2010750 × 520 (46 KB)Woudloper{{Information |Description={{en|1=IUGS classification of extrusive rocks according to their relative alkali (Na<sub>2</sub>O + K<sub>2</sub>O) and silica (SiO<sub>2</sub>) weight contents. Blue area is roughly where alkaline rocks plot; yellow

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