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
- GRR 549 spectrum; Winchite, from an alkalic dyke, in Ottawa Valley, Ontario, Canada. plotted as 0.327 mm thick. (expanded visible range)
- 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-11188
spectrum; Pargasite, Chelan, WA, plotted as 0.075 mm thick. Data files: alpha; beta; gamma
- CIT-12573
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; Fluororichterite, 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
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to the Index of Data Files
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Mineral Spectroscopy home page
revised 27-Aug-2022