General Magnesiosadanagaite Information
|
 Chemical Formula: |
NaCa2[Mg3(Al,Fe+++)2]Si5AlO22(OH)2 |
| Composition: |
Molecular Weight = 869.29 gm |
| |
Potassium 0.41 % K 0.49 % K2O |
| |
Sodium 2.48 % Na 3.35 % Na2O |
| |
Calcium 8.98 % Ca 12.57 % CaO |
| |
Magnesium 8.12 % Mg 13.47 % MgO |
| |
Titanium 1.62 % Ti 2.71 % TiO2 |
| |
Manganese 0.14 % Mn 0.18 % MnO |
| |
Aluminum 11.12 % Al 21.01 % Al2O3 |
| |
Chromium 0.01 % Cr 0.01 % CrO |
| |
Iron 5.28 % Fe 6.20 % FeO / 0.55 % Fe2O3 |
| |
Silicon 17.43 % Si 37.29 % SiO2 |
| |
Hydrogen 0.23 % H 2.07 % H2O |
| |
Oxygen 44.17 % O |
| |
______ ______ |
| |
100.00 % 99.89 % = TOTAL OXIDE |
| Empirical Formula: |
Na0.9(OH)2K0.09Ca1.94Na0.03Mg0.02Mg2.88Fe2+0.75Fe3+0.06Mn2+0.02Cr0.001Ti0.29Al0.97
Si5.39Al2.6O22 |
| Environment: |
The mineral occurs in a compositionally zoned crystal with a pargasite core in a contact aureole consisting predominantly of calcareous rocks adjacent to granite. Amphibole group. |
| IMA Status: |
Approved IMA 2004 (Dana # Added) |
| Locality: |
Kasuga-mura, Gifu Prefecture, central Japan. Occurrences in the eastern Alps and in Yunnan Province, China, are also known. Link to MinDat.org Location Data. |
| Name Origin: |
Named as a low-K analog of potassic-magnesiosadanagaite (renamed from original magnesiosadanagaite-IMA1982-102). |
| Synonym: |
IMA2002-051 |
| |
