Mineralogy Database

Allophane Mineral Data

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General Allophane Information

Help on Chemical  Formula: Chemical Formula: Al2O3•(SiO2)1.3-2•((H2O))2.5-3
Help on Composition: Composition: Molecular Weight = 225.11 gm
   Aluminum  23.97 %  Al   45.29 % Al2O3
   Silicon   16.22 %  Si   34.70 % SiO2
   Hydrogen   2.24 %  H    20.01 % H2O
   Oxygen    57.57 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: (Al2O3)(SiO2)1.3•2.5(H2O)
Help on Environment: Environment: In marlstone rocks (TL) and weathering product of volcanic ash.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1816
Help on Locality: Locality: Grafenthal, Thuringia, Germany Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek allos - "other" and phanos - "to appear" in allusion to its change when blowpiped.
Help on Name Pronunciation: Name Pronunciation: Allophane + Pronunciation Say ALLOPHANE
Help on Synonym: Synonym: Ilbaite