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Feldspars = igneous rock type part of Felsic series

K+x+y(Al2-xMgx) (Si4-yAly)O10(OH)2 = montmorillonite

Volcanic basalt rock - a mineral is olivine (monomer silicate)
mafic (Fe,Mg) volcanic rock. preponderance of calcic plagioclase feldspar and pyroxene. Olivine is common

1 cmol kg-1 = 1 meq/100g