quartz (mono- and polycrystalline) and glauconite (up to 50%, often altered to iron(hydr)oxides), cemented together by iron (hydr)oxides (limonite), intergranular porosity
Texture
fine to coarse grain size; poorly sorted; sub-angular quartz and rounded glauconite grains
Houthuys R. 2014. A reinterpretation of the Neogene emersion of central Belgium based on the sedimentary environment of the Diest formation and the origin of the drainage pattern. Geologica Belgica 17, 3/4: 211-235.