smectite
Noun
Meaning
A hydrous silicate of alumina, of a greenish color, which, in certain states of humidity, appears transparent and almost gelatinous.
Source: Webster's dictionarySynonyms
calcite
feldspar
dolomite
chlorite
gibbsite
diatomaceous earth
glauconite
goethite
biotite
chrysotile
bentonite
brucite
nontronite
antigorite
imogolite
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Examples
Electron microscope photograph of smectite clay – magnification 23,500 Clays are distinguished from other fine-grained soils by differences in size and mineralogy.
Kimberlite deposits are known as blue ground for the deeper serpentinized part of the deposits, or as yellow ground for the near surface smectite clay and carbonate weathered and oxidized portion.