| |
 |
Preiswerkite Mineral Data
|
|
|
General Preiswerkite Information
|
 Chemical Formula: |
NaMg2Al3Si2O10(OH)2 |
| Composition: |
Molecular Weight = 402.72 gm |
| |
Sodium 5.71 % Na 7.69 % Na2O |
| |
Magnesium 12.07 % Mg 20.02 % MgO |
| |
Aluminum 20.10 % Al 37.98 % Al2O3 |
| |
Silicon 13.95 % Si 29.84 % SiO2 |
| |
Hydrogen 0.50 % H 4.47 % H2O |
| |
Oxygen 47.67 % O |
| |
______ ______ |
| |
100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
NaMg2Al3Si2O10(OH)2 |
| Environment: |
Formed in a rodingite dike during upper-greenschist to lower-amphibolite facies metamorphism. |
| IMA Status: |
Approved IMA 1980 |
| Locality: |
In the Geisspfad ultramafic complex, Binntal, Valais, Switzerland. Link to MinDat.org Location Data. |
| Name Origin: |
Named for H. Preiswerk (1876-1940), Professor in Basel, Switzerland. |
| Name Pronunciation: |
Preiswerkite + Pronunciation  |
| |