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- Clay
mineral, hydrous aluminous silicate, Al4Si4O10(OH)8.
Structure consists of one sheet of
silicon-oxygen tetrahedra each
sharing three oxygens to give ratio of (Si4O10)4-
linked with one sheet of aluminum and hydroxyl. Composition of pure kaolinite does not vary
as for other clay minerals,
montmorillonite and
illite, in which ready addition or substitution of ions
takes place.
Source: Leet, L. Don. 1982.
Physical Geology, 6th Edition. Englewood Cliffs, NJ: Prentice-Hall
- a. A monoclinic mineral, 2[Al2 Si2 O5 (OH)4 ];
kaolinite-serpentine group; kaolinite structure consists of a sheet of
tetrahedrally bonded silica and a sheet of octahedrally bonded alumina
with little tolerance for cation exchange or expansive hydration;
polymorphous with dickite, halloysite, and nacrite; soft; white; formed by
hydrothermal alteration or weathering of aluminosilicates, esp. feldspars
and feldspathoids; formerly called kaolin.
b. Kandites in general.
c. Individual kandites not specif. designated. See also: alum salt;
kaolin.
Source:
Dictionary of Mining, Mineral, and Related Terms
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