Amphibole Visible Spectra (generally 350 - 2500 nm)
Amphiboles absorb light primarily because of Fe2+
in the M1,M2,M3
and M4 sites, Fe3+
and Cr3+
in the M2,M1 and M3 sites,
and the Fe2+
- Ti4+
or the Fe2+
- Fe3+
intervalance charge transfer.
Images of representative amphiboles
Spectra dominated by Fe2+
absorption. The strong band
near 1000 nm is from Fe2+
in the M4 site
- UCLA
MS2858 spectrum; Pargasite,
Oxbrow, NJ, plotted as 1.00 mm thick. Data Files: alpha,
5K; beta,
3K; gamma, 4K
-
CIT 7076 spectrum;
Actinolitic
Hornblende, Kragero, Norway, plotted as 0.10 mm. Data Files: alpha, 2K;
beta,
2K; gamma, 2K;
-
CIT 7223 spectrum;
Grunerite,
Heath Lake, Canada, plotted as 0.1 mm. Data Files: alpha, 5K;
beta,
3K; gamma, 5K;
-
CIT 8038 spectrum;
Tremolite,
Mt. Bity, Madagascar, plotted as 0.5 mm. Data Files: alpha, 4K;
beta,
4K; gamma, 3K;
Spectra
dominated by Fe - Ti intervalence charge transfer
- GRR 1029
image; Kaersutite,
Luchkow, Czech Republic, plotted for 0.05 mm.. Data Files: alpha, 1K;
beta,
1K; gamma, 1K
Spectra
with a major Cr component
- UCLA MS2843
image; Actinolite,
Cloverdale, California. Data Files: alpha,7K;
beta,7K;
gamma,5K
-
CIT 7222 image;
Actinolite,
Washington, USA, plotted for 1 mm. Data Files: alpha,
6K;
beta,
5K; gamma, 5K
Back
to the
list of visible data files
Back
to the Index to Data Files
