File:Classification extrusive rocks EN.svg
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 19:12, 12 May 2010 | | 750 × 520 (46 KB) | commons>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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