Noun
An oxide containing three atoms of oxygen with two atoms (or radicals) of some other substance; thus, alumina, Al2O3 is a sesquioxide.
Source: Webster's dictionaryAmorphous and sesquioxide clays have the highest AEC, followed by the iron oxides. Source: Internet
Even heavier weathering results in sesquioxide clays.sfnsfnsfnsfnsfnsfn silica-sesquioxide Crystalline chain clays The carbonate and sulfate minerals are much more soluble and hence are found primarily in desert soils where leaching is less active. Source: Internet
It takes hundreds of thousands of years of leaching to create sesquioxide clays. Source: Internet
The heavy rains wash the alumino-silicate clays from the soil leaving only sesquioxide clays of low CEC. Source: Internet