sesquioxides

Both kaolinite and sesquioxides have little ability to store nutrients in the soil and their presence indicates a need to improve the soil by adding organic matter.

5. How plants live and grow 1991

Montmorillonite and vermicullite are the clays with the highest CEC, illite has less, and kaolinite and sesquioxides have a very low CEC.

5. How plants live and grow 1991

The latter are defined in a number of ways, but the following definition is often accepted: The ratio of silica to sesquioxides (that is iron and aluminium oxides) must be less than 1.33 for the material to be a laterite.

Chapter 5 1984

The sesquioxides dissolve in ammonia without escape of nitrogen, and are usually anhydrous.

Scientific American Supplement, No. 441, June 14, 1884. Various

It was extracted from ruddle (red ochre) and limonite (brown ochre or hydrous oxide of iron): both are sesquioxides (Fe2O3) which become dark when heated and change to magnetic oxide (Fe3O4).

The Land of Midian — Volume 1 Richard Francis Burton 1855

Ross, the learned author of "Pyrology, or Fire Chemistry," [EN#24] it is iserine or magnetic ilmenite, titaniferous iron-sand, containing eighty-eight per cent. of iron (oxides and sesquioxides), with eleven per cent. of titanic acid.

The Land of Midian — Volume 1 Richard Francis Burton 1855

(brown ochre or hydrous oxide of iron): both are sesquioxides

The Land of Midian 2003

(oxides and sesquioxides), with eleven per cent. of titanic acid.

The Land of Midian 2003