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potassic series
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potassic series

geology
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The potassic series is a classification of igneous rocks, specifically within the alkaline group. Igneous rocks are categorized by their mineralogy, chemistry, and texture. The alkaline rocks, which include the potassic series, are often undersaturated with silica. This means they tend to form minerals like nepheline rather than quartz or orthopyroxene.12

The classification of volcanic and hypabyssal rocks often relies on chemical composition due to their fine-grained texture. The potassic series is a subdivision of the calc-alkalic series, distinguished by the relative proportions of soda and potash. These rocks frequently occur on oceanic islands and in continental rifts.1

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3 Britannica Sources
  1. igneous rock - Classification of volcanic and hypabyssal rocks
  2. igneous rock - Mineralogical components
  3. igneous rock - Bowen’s reaction series

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