Amphibole Visible Spectra (generally 350 - 2500 nm)
Amphiboles absorb light primarily because of Fe2+
in the M1,M2,M3
and M4 sites, Fe3+, Cr3+,
and V3+ 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
- CIT-290
spectrum; Tremolite, St. Lawrence County, NY, plotted as 1.0
mm thick. Data files: alpha; beta; gamma
- CIT-309 spectrum; Actinolite, San Bernardion Co, CA. Plotted as 0.50 mm thick. Data files: alpha; beta; gamma
- CIT-4916
spectrum; Actinolite, Zillerthal Austria, plotted at 0.40 mm
thick. (with some Fe2+-Fe3+
intervalence charge transfer). Data files: alpha; beta; gamma
- CIT-4924
spectrum; Tremolite, Macob, NY, plotted as 1.50 mm thick. Data files: alpha; beta; gamma
- CIT-6191
spectrum; Actinolite, Chester, VT, plotted as 0.40 mm thick. Data files: alpha; beta; gamma
- CIT-7076 spectrum;
Actinolitic
Hornblende, Kragero, Norway, plotted as 0.10 mm. Data Files: alpha; beta;
gamma
- CIT-7223
spectrum;
Grunerite,
Heath Lake, Canada, plotted as 0.1 mm. Data Files: alpha; beta;
gamma
- CIT-8038
spectrum;
Tremolite,
Mt. Bity, Madagascar, plotted as 0.5 mm. Data Files: alpha; beta;
gamma
- UCLA
MS2824E; Tremolite, Haliburton, Ontario, Canada, plotted as
1.20 mm thick. Data files: alpha; beta; gamma
- UCLA
MS2842 spectrum; Actinolite, Lone Pine, CA, plotted as 0.50
mm thick. Data files: alpha; beta; gamma
- UCLA
MS2858 spectrum; Pargasite,
Oxbrow, NJ, plotted as 1.00 mm thick. Data Files: alpha;
beta; gamma
Spectra
dominated by Fe - Ti intervalence charge transfer
- GRR
1029 spectrum; Kaersutite,
Luchkow, Czech Republic, plotted for 0.05 mm.. Data Files: alpha; beta;
gamma
- CIT-1188
spectrum; Pargasite, Chelan, WA, plotted as 0.075 mm thick. Data files: alpha; beta; gamma
- CIT-5373
spectrum; Pargasite, Pargas, Finland, plotted as 0.120 mm
thick. Data files: alpha; beta; gamma
- CIT-8037
spectrum; Pargasite, Verona, Ontario, Canada, plotted as 0.40
mm thick. Data files: alpha; beta; gamma
- CIT-8044 spectrum; Pargasite, Bancroft, Ontario, Canada plotted as 0.05 mm thick. Data files: alpha; beta; gamma
- CIT-8019
spectrum; Richterite, Wilberforce, Ontario, Canada, plotted as
1.0 mm thick. Data files: alpha; beta; gamma
- CIT-10668 spectrum, Reibeckite, St. Peter's Dome, Pike's Peak, Colorado, USA. Plotted as 0.03 mm thick. Data files; alpha; beta; gamma
Spectra
with a major Cr or V component
- UCLA
MS2843 spectrum; Actinolite,
Cloverdale, California, plotted for 1 mm, is green from chromium. Data
Files: alpha; beta; gamma
- CIT
7222 spectrum;
Actinolite,
Washington, USA, plotted for 1 mm, is green from chromium. Data Files: alpha; beta;
gamma
- GRR 2544, "Chrome
tremolite", Merelani Hills, Tanzania, is actually colored by
vanadium 3+.
- GRR
1823 spectrum; Tremolite from Magadi, Kenya, plotted as 1.0
mm thick. Data files: alpha; beta
Spectra with multiple origins
Spectra
dominated by manganese
Link to an extensive collection
of references to mostly color and visible spectroscopy of
amphiboles
Back
to the list of minerals
Back
to the Index of Data Files
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Mineral Spectroscopy home page
revised 27-Aug-2022