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The following links are provided
to illustrate the wide range of applications of CL. We have no
financial interest in any of the organizations or individual
mentioned except to note that they are customers of RELION. If you
do contact them, we would appreciate your mentioning that you heard
about them through our web site. |
Material/Description
|
Contributor
(Many Thanks!)
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Click To Show Full-Size
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| Benthic foram from Jurassic Bugarone Formation, Apennines.
CL image. Foram and cements are calcite. Dolomite rhombs abound outside foram. 12 kV, 0.5
mA. Foram is about 200 microns wide. Reconditioned Luminoscope® furnished by
RELION Industries. |
Erick Staley, U. California, Berkeley. |
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| Same sample of benthic
foram, transmitted light. |
Erick Staley, U. California, Berkeley. |
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CL image of a sulfide-calcite veinlet cutting altered andesitic hornfels.
Brilliant yellow orange CL is calcite (Mn+2 activation). Grains with lemon
yellow CL are apatite (also Mn+2 activation). K-spar exhibits light blue CL.
The orange red CL is a calcite with different activators/quenchers. Photo
courtesy of Jim Clark and AMT (USA) Inc. |
Jim
Clark, Applied Petrographics, Tucson, AZ |
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| Two yellow luminescing natural
chromium diopsides from Brazil contrast the brownish red CL of four
natural chromium diopsides from Russia. The outer left Brazilian stone is
8.5 mm long. Cond. excit.: 9.0 kV; 0.7 mA.
|
Dr. Johann
Ponahlo, Vienna |
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| Natural cut diamond (0.56 ct)
showing Pueblo-zoning i.e. a trapezoidal growth feature that can only be
observed by CL bombardments of natural untreated light yellow to brown
colored diamonds. Cond. excit.: 10 kV; 0.95 mA.
|
Dr. Johann
Ponahlo, Vienna |
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| A synthetic experimental diamond
of De Beers of 0.90 ct with sectoral growth features. The yellowish
green luminescing sector top right is the basal plane (001). The strictly
zonated sector in the lower left lies parallel to a (111) plane. Between
both a small blue sector of a higher indexed plane becomes visible. Other
planes show no luminescence. The orange needles are a still
unknown feature. Cond.excit.: 9.5 kV; 0.9 mA.
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Dr. Johann
Ponahlo, Vienna |
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| CL colours of three colorless cut
stones: the blue CL colour is the intrinsic feature of a 13.18 ct
brilliant-cut topaz of 16 mm diameter. A brown CL exhibits the 4.12 ct
scapolite in the lower left, and the red CL is due to minute amounts of
threevalent chromium ions in an old synthetic leucosapphire. Cond.excit.:
7.5 kV; 0.8 mA.
|
Dr. Johann
Ponahlo, Vienna |
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| CL of two nearly opaque colorless
cabochons: The red CL belongs to a 2.53 ct Geuda sapphire from Sri Lanka
prior to its heat treatment when its daylight color turns into a
fine blue. The nearly egg yolk CL color has to be attributed to manganese
activator ions in a rare apatite cat’s eye from the Austrian Alps
(Museum for Natural History Vienna, No. M3894). Cond.excit.: 12 kV; 0.9 mA.
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Dr. Johann
Ponahlo, Vienna |
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| Why we like to travel!
View of the Dachstein mountain range and the Hallstatt glacier, near
the village of Dachstein, Austria. Rock salt has been mined in this area for more than
2,500 years. The area is also of great interest to archaeologists and they continue to find new interesting artifacts
there - maybe another frozen traveler from the past?. |
Dr. Johann
Ponahlo, Vienna |
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![[Under Construction]](images/undercon.gif)
