Ferrocolumbite
FeNb2O6
wdx 
edx
thin film 
thin foil
xrf
edx
thin film
thin foil
xrf
Location
Haddam, Connecticut, USA
Dana Class
08.03.02.02
Strunz Class
04.DB.35
| Element | WT% |
| Mn | 6.19% |
| Fe | 6.89% |
| Nb | 27.08% |
| Ta | 36.36% |
| O | 23.47% |
| Compound | WT% |
| MnO | 7.99% |
| FeO | 8.87% |
| Nb2O3 | 38.74% |
| Ta2O5 | 44.40% |
