| |
 |
Omphacite Mineral Data
|
|
|
General Omphacite Information
|
 Chemical Formula: |
(Ca,Na)(Mg,Fe++,Al)Si2O6 |
| Composition: |
Molecular Weight = 211.37 gm |
| |
Sodium 3.26 % Na 4.40 % Na2O |
| |
Calcium 11.38 % Ca 15.92 % CaO |
| |
Magnesium 6.90 % Mg 11.44 % MgO |
| |
Aluminum 3.83 % Al 7.24 % Al2O3 |
| |
Iron 2.64 % Fe 3.40 % FeO |
| |
Silicon 26.57 % Si 56.85 % SiO2 |
| |
Oxygen 45.42 % O |
| |
______ ______ |
| |
100.00 % 99.24 % = TOTAL OXIDE |
| Empirical Formula: |
Ca0.6Na0.3Mg0.6Al0.3Fe2+0.1Si2O6 |
| Environment: |
Major constituent of eclogite, commonly in kimberlite pipes; from some ophiolites and glaucophane-bearing blueschist facies rocks. |
| IMA Status: |
Valid Species (Pre-IMA) 1815 |
| Locality: |
Tiburon Pininsula, Marin County, and Sonoma County, California, USA. Link to MinDat.org Location Data. |
| Name Origin: |
From the Greek for "unripe grapes", in allusion to its green color. |
| Name Pronunciation: |
Omphacite + Pronunciation  |
| Synonym: |
ICSD 63236 |
| |
PDF 42-568 |
| |