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Kaolinite Subgroup

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About Kaolinite SubgroupHide

Dioctahedral, Al-rich members of the Kaolinite-Serpentine Group.

Within this group kaolinite, dickite and nacrite are actually polytypes of a single species, but the names have been "grandfathered" by the IMA. The species should probably be kaolinite, with -1A (kaolinite), -1M (nacrite), and -2M (dickite) polytypes. Most of the species in this group have multiple polytypes due to stacking sequence variations.

Chemical Properties of Kaolinite SubgroupHide


Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0000126DickiteBailey S W (1963) Polymorphism of the kaolin minerals American Mineralogist 48 1196-120919630293
0003170DickiteDera P, Prewitt C T, Japel S, Bish D L, Johnston C T (2003) Pressure-controlled polytypism in hydrous layered materials American Mineralogist 88 1428-143520030293
0003171DickiteDera P, Prewitt C T, Japel S, Bish D L, Johnston C T (2003) Pressure-controlled polytypism in hydrous layered materials American Mineralogist 88 1428-143520034.1293
0012236DickiteBish D L, Johnston C T (1993) Rietveld refinement and Fourier-transform infrared spectroscopic study of the dickite structure at low temperature Clays and Clay Minerals 41 297-3041993St. Claire, Pennsylvania, USA012
0014797DickiteJoswig W, Drits V A (1986) The orientation of the hydroxyl groups in dickite by X-ray diffraction Neues Jahrbuch fur Mineralogie, Monatshefte 1986 19-221986Kilantyubinsk mine, USSR0293
0017947KaoliniteGruner W (1932) The Crystal Structure of Kaolinite _cod_database_code 1011045 Zeitschrift fur Kristallographie 83 75-8819320293
0012232KaoliniteBish D L, Von Dreele R B (1989) Rietveld refinement of non-hydrogen atomic positions in kaolinite Clays and Clay Minerals 37 289-2961989Keokuk, Iowa, USA0293
0012237KaoliniteBish D L (1993) Rietveld refinement of the kaolinite structure at 1.5 K Clays and Clay Minerals 41 738-7441993Keokuk, Iowa, USA01.5
0017977NacriteGruner J (1933) The crystal structure of Nacrite and a comparison of certain optical properties of the caolin group with its structures _cod_database_code 1011080 Zeitschrift fur Kristallographie 85 345-35419330293
0017961NacriteHendricks S (1939) The Crystal Structure of Nacrite Al2 O3 * 2Si O2 * 2H2 O and the Polymorphism of the Kaolin Minerals. _cod_database_code 1011062 Zeitschrift fur Kristallographie 100 509-51819390293
0012238NacriteZheng H, Bailey S W (1994) Refinement of the nacrite structure Clays and Clay Minerals 42 46-521994Red Mountain near Silverton, Colorado, USA0293
0012394NacriteZhukhlistov A P (2008) Crystal structure of nacrite from the electron diffraction data Crystallography Reports 53 76-8220080293
CIF Raw Data - click here to close

Relationship of Kaolinite Subgroup to other SpeciesHide

Other Members of this group:
Odinite(Fe,Mg,Al,Fe,Ti,Mn)2.4((Si,Al)2O5)(OH)4Mon. m : Bm
Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
Group Members:
Dickite Al2(Si2O5)(OH)4Mon. m : Bb
Halloysite Al2(Si2O5)(OH)4Mon. m : Bb
Kaolinite Al2(Si2O5)(OH)4Tric. 1 : P1
Nacrite Al2(Si2O5)(OH)4Mon. m : Bb

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Kaolinite Subgroup in petrologyHide

Internet Links for Kaolinite SubgroupHide

Localities for Kaolinite SubgroupHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListShow

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