| |
 |
Allophane Mineral Data
|
|
|
General Allophane Information
|
 Chemical Formula: |
Al2O3•(SiO2)1.3-2•((H2O))2.5-3 |
| 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 |
| Empirical Formula: |
(Al2O3)(SiO2)1.3•2.5(H2O) |
| Environment: |
In marlstone rocks (TL) and weathering product of volcanic ash. |
| IMA Status: |
Valid Species (Pre-IMA) 1816 |
| Locality: |
Grafenthal, Thuringia, Germany Link to MinDat.org Location Data. |
| Name Origin: |
From the Greek allos - "other" and phanos - "to appear" in allusion to its change when blowpiped. |
| Name Pronunciation: |
Allophane + Pronunciation  |
| Synonym: |
Ilbaite |
| |
Protoallophane |
| |
Schrotterite |
| |