Cold cathodoluminescence is the
emission of rays of light from crystalline minerals by excitation
with cathode rays. A cold cathode gun with an active
current of 620 to 630 mA paired with an ordinary light
microscope directs the electrons from a discharge of gas onto
the samples. The electrons are generated under vacuum at a
cathode and are pulsated toward an anode over a potential
difference of 15 kV, before striking the sample. By using a
high vacuum, the energy that is imported to electrons in activator
ions within the grain causes luminescence.
The cold cathodoluminescence (CL) can measure many
properties. It is mostly helpful in determining rock composition
and mineral arrangement, revealing growth-zoning
cements, separation of quartz overgrowths from detrital
quartz, and intensity and localization of fracturing and fracture
cements. The CL microscope is very useful for determining
and studying the diagenesis of quartz-rich sandstones. It
is possible to classify different quartzite samples according to
their luminescence.
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