Mineralogy Database

Halloysite Mineral Data

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General Halloysite Information

Help on Chemical  Formula: Chemical Formula: Al2Si2O5(OH)4
Help on Composition: Composition: Molecular Weight = 258.16 gm
   Aluminum  20.90 %  Al   39.50 % Al2O3
   Silicon   21.76 %  Si   46.55 % SiO2
   Hydrogen   1.56 %  H    13.96 % H2O
   Oxygen    55.78 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Al2Si2O5(OH)4
Help on Environment: Environment: A product of hydrothermal alteration or surface weathering of aluminosilicate minerals, as feldspars. Formed by dehydration of endellite above 110 deg. C.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1826
Help on Locality: Locality: Angleur, Li´┐Żege, Belgium. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after Baron Omalius d'Halloy (1707-1789).
Help on Name Pronunciation: Name Pronunciation: Halloysite + Pronunciation Say HALLOYSITE
Help on Synonym: Synonym: Endellite
  ICSD 26716
  PDF 29-1489
  halloysite-10 Ang.