Ultrapotassic igneous rocks
Class of rare ultramafic or mafic igneous rocks rich in potassium / From Wikipedia, the free encyclopedia
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Ultrapotassic igneous rocks are a class of rare, volumetrically minor, generally ultramafic or mafic silica-depleted igneous rocks.
While there are debates on the exact classifications of ultrapotassic rocks, they are defined by using the chemical screens K2O/Na2O > 3 in much of the scientific literature.[1] However caution is indicated in interpreting the use of the term "ultrapotassic", and the nomenclature of these rocks continues to be debated, with some classifications using K2O/Na2O > 2 to indicate a rock is ultrapotassic.