Trachybasalt

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.[2] Trachybasalt is a basalt with high alkali content (5 to 7% Na₂O + K₂O, see TAS diagram).

A variety of trachybasalt from Yamalo-Nenets Autonomous Okrug in Russia, known there as enzorite

Satellite image of Bayuda volcanic field in Sudan where nepheline-rich trachybasalt lavas have been erupted during the Holocene epoch[1]

References

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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 basalt
Important minerals	Olivine Pyroxene Plagioclase Amphibole Magnetite Ilmenite Quartz Cristobalite Trydimite

Volcanoes
Types	Caldera Cinder cone Complex volcano Cryovolcano Fissure vent Lava cone Lava dome Maar Mud volcano Parasitic cone Pyroclastic cone Pyroclastic shield Rootless cone Shield volcano Somma volcano Stratovolcano Subglacial volcano Submarine volcano Supervolcano Volcanic cone
Volcanic rocks	Agglomerate Andesite Basalt Basaltic andesite Benmoreite Blairmorite Dacite Felsite Komatiite Latite Leucitite Nephelinite Obsidian Phonolite Phonotephrite Rhyodacite Rhyolite Tephriphonolite Trachyandesite Trachybasalt Trachyte Tuff
Lists and groups	Hotspot Lists of volcanoes Decade Volcanoes Volcanic arc Volcanic belt Volcanic field monogenetic polygenetic
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