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Trachybasalt is a "volcanic rock with a composition between "trachyte and "basalt. Minerals in trachybasalt include alkali "feldspar, calcic "plagioclase, "olivine, "clinopyroxene and likely very small amounts of "leucite or "analcime.[1] Trachybasalt is a basalt with high "alkali content (5 to 7% Na2O + K2O, see "TAS diagram).


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