(2007) regarding the formation of pisoliths
, which cannot be treated here.
In overlying deposits, the carbonate occurs as indurated laminar and rubbly horizons as well as pisoliths
and laminar coatings on clasts.
Iron (Fe) nodules and pisoliths
are a common feature of many soils and weathering profiles in the tropics, subtropics, regions of Mediterranean climate and even temperate regions (Amouric et al.
The remainder contains 20% to 30% nodules or "pisoliths
" of a black, dense glassy material, which is a fused alumina and trace magnetic iron oxides.
The Goulburn district bauxite deposits typically have an upper half that contains nodules or "pisoliths
" of a black, glassy material which is an emery, comprising mainly fused alumina and trace iron oxides.