• Alok Krishna GuptaEmail author
Part of the Springer Geology book series (SPRINGERGEOL)


Potassium-rich silica-undersaturated mafic igneous rocks are characterised by the presence of leucite, K-feldspar , clinopyroxene and Fe–Ti oxides. Plagioclase feldspar commonly appears in tephrites, tephritic phonolites and phonolitic tephrites . In sodium-rich potassic rocks such as basanites, forsteritic olivine appears along with nepheline.


Lava Flow Tetrahedral Site TiO2 Content Ultrapotassic Rock Potassic Rock 
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© Springer India 2015

Authors and Affiliations

  1. 1.Mineralogy and PetrologyUniversity of AllahabadAllahabadIndia

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