| |
 |
Cuspidine Mineral Data
|
|
|
General Cuspidine Information
|
 Chemical Formula: |
Ca4Si2O7(F,OH)2 |
| Composition: |
Molecular Weight = 365.48 gm |
| |
Calcium 43.86 % Ca 61.37 % CaO |
| |
Silicon 15.37 % Si 32.88 % SiO2 |
| |
Hydrogen 0.14 % H 1.23 % H2O |
| |
Oxygen 32.83 % O |
| |
Fluorine 7.80 % F 7.80 % F |
| |
- %
F -3.28 % -O=F2 |
| |
______ ______ |
| |
100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
Ca4Si2O7F1.5(OH)0.5 |
| Environment: |
Ejected masses from Mte. Somma, Vesuvius. |
| IMA Status: |
Valid Species (Pre-IMA) 1876 |
| Locality: |
At Monte Somma and Vesuvius, Campania, and in the Alban Hills, as at Ariccia, Lazio, Italy. Link to MinDat.org Location Data. |
| Name Origin: |
From the Greek cuspis, for a spear, the characteristic shape of the twinned crystals. |
| Synonym: |
Custerite |
| |
ICSD 34339 |
| |
PDF 41-1474 |
| |