Trachybasalt

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Trachybasalt is a volcanic rock with a composition between trachyte and basalt. Minerals included 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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v t e Types of basalts

Basalts by tectonic setting	Flood basalt Mid-ocean ridge basalt Ocean island basalt Volcanic arc basalt

Basalts by form and flow	Columnar basalt Pillow basalt Aa lava Pahoehoe lava

Basalts by chemistry	Tholeiitic basalt Calc-alkaline basalt Alkali basalt Trachybasalt Hawaiite Mugearite Picrite

Important minerals	Olivine Pyroxene Plagioclase Amphibole Magnetite Ilmenite Quartz Cristobalite Trydimite

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