Pyroxene Visible Spectra (generally 350 - 2500 nm)
polarizations: (a = alpha direction; b = beta direction; g = gamma
direction)
Pictures of pyroxenes showing the pleochroism
Enstatite polarized
parallel to the c-axis; two crystals, one from Tanzania, the other from
Myanmar
Enstatite polairzed
parallel to the b-axis
Both,
compared
side-by-side.
T
Images of representative orthopyroxene spectra
- enstatite
spectrum; Enstatite (bronzite,
Fs 14.0), GRR 40, Bamble, Norway, 0.100 mm thick with Fe2+
in
the M2 site dominating the spectrum. Data Files: alpha; beta; gamma. Image of the alpha band on
scale
(0.095 mm thick). Data File: alpha
on scale
- enstatite
spectrum; Enstatite (hypersthene,
Fs 39.5), GRR 1653, Summit Rock, Oregon, 0.10 mm thick With type Fe2+
in the M2 site dominating the spectrum and a M1 site feature near 1200
nm. Data Files: alpha;
beta; gamma
- Enstatite
spectrum, GRR 1087, from Tanzania, plotted as 0.500 mm
thick. This is the sample pictured above.Data Files: alpha; beta; gamma
Synthetic orthopyroxenes containing various transition elements.
- (Mg,Co)SiO3
spectrum, GRR 247, from Jun Ito, plotted as 0.100 mm thick.
Data files: alpha;
beta; gamma
- (Mg,Ni)SiO3 spectrum,
GRR 248, from Jun Ito, plotted as
0.200 mm thick. Data files: alpha;
beta; gamma
- (Mg,Co,Mn)SiO3 spectrum,
GRR 250, from Jun Ito, plotted as 0.100 mm thick.
Data files: alpha;
beta; gamma
Synthetic clinopyroxene containing various transition elements.
Synthetic protopyroxene containing vanadium.
Images of representative clinopyroxene spectra
- Augite spectrum; Augite, GRR 13477, Maui, Hawaii, 0.100 mm thick with Fe2+
in the M2 site providing major features near 1000 and 2300 nm. Data
Files: alpha; beta; gamma
- Augite spectrum; Augite, GRR 583, CIT 13748, Cedar Butte, Oregon
, 0.10 mm
thick with Fe2+
in the M2 site dominating the spectrum. Data Files: alpha; beta;
gamma
- Diopside spectrum; Diopside, GRR 472, CIT 7524, Binntal Wallis,
Switzerland
, 0.50 mm thick. This shows both
Fe2+ and Fe2+ - Fe3+
intervalence charge
transfer. Data Files: alpha;
beta; gamma
- Diopside spectrum; Diopside, RDS 62047-70, chromian
,
Russia, 1.00 mm thick. The band at 1030 nm is from Fe2+
whereas the other features are from Cr3+. The
crystal contains
0.558 wt% Cr2O3.
This was taken with light
polarized along each crystallographic axis. Data Files: E||b.
- Hedenbergite
spectrum; Hedenbergite, CIT-12593, from the Obersulzbach Valley,
Salzburg, Austria, 0.250 mm thick.Intervalence charge transfer between
Fe2+ - Fe3+ occurs near
790 nm and features from Fe2+ in the
M(1) site occur near 967 and 1190 nm. A feature from Fe2+
in the M(2) site occurs near 1030 nm. Data Files: alpha; beta; gamma
- Jadeite
spectrum; Jadeite from Kazakhstan,
polycrystalline mass run unpolarized and normalized to 10 mm
thick.
The spectrum is dominated by Cr3+ but also shows
the Fe3+
band near 440 nm. Data file: Contributed data from
Anton Vasiliev,
LAL, Moscow: unpolarized.
- Spodumene spectrum; Spodumene,
GRR 151, lavendar colored kunzite variety, Pala, California, USA, 10.0 mm thick
showing Mn3+ features. Data Files: alpha not ready; beta
not ready ; gamma not ready
- Spodumene
spectrum; Spodumene, CIT 11149, green hiddenite
from North Carolina,
USA. Thickness: 2.96 mm, two polarizations on the cleavage
110 face.
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last modified 12-Sep-2018