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- Alkali_basalt abstract "Alkali basalt is a fine-grained, dark-coloured, volcanic rock characterized by phenocrysts of olivine, titanium-rich augite, plagioclase feldspar and iron oxides. For similar SiO2 concentrations, alkali basalts have a higher content of the alkalis, Na2O and K2O, than other basalt types such as tholeiites. They are also characterized by the development of modal nepheline in their groundmass (visible at highest magnification on a petrographic microscope) and normative nepheline in their CIPW norms. Alkali basalts are typically found on updomed and rifted continental crust, and on oceanic islands such as Hawaii, Madeira and Ascension Island.".
- Alkali_basalt wikiPageID "23824686".
- Alkali_basalt wikiPageRevisionID "452974918".
- Alkali_basalt hasPhotoCollection Alkali_basalt.
- Alkali_basalt subject Category:Aphanitic_rocks.
- Alkali_basalt subject Category:Basalt.
- Alkali_basalt type AphaniticRocks.
- Alkali_basalt type NaturalObject100019128.
- Alkali_basalt type Object100002684.
- Alkali_basalt type PhysicalEntity100001930.
- Alkali_basalt type Rock109416076.
- Alkali_basalt type Whole100003553.
- Alkali_basalt comment "Alkali basalt is a fine-grained, dark-coloured, volcanic rock characterized by phenocrysts of olivine, titanium-rich augite, plagioclase feldspar and iron oxides. For similar SiO2 concentrations, alkali basalts have a higher content of the alkalis, Na2O and K2O, than other basalt types such as tholeiites.".
- Alkali_basalt label "Alkali basalt".
- Alkali_basalt sameAs m.06_tx76.
- Alkali_basalt sameAs Q4727640.
- Alkali_basalt sameAs Q4727640.
- Alkali_basalt sameAs Alkali_basalt.
- Alkali_basalt wasDerivedFrom Alkali_basalt?oldid=452974918.
- Alkali_basalt isPrimaryTopicOf Alkali_basalt.