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Cathodoluminescence (CL) is the emission of visible light from
a sample, specifically from 'activator' sources in the structure, due to
electron-specimen interaction. The example shows both sector and concentric
zoning in hydrothermal vein quartz, possibly due to Al variation. The sample
has been polished flat and is viewed looking down the (0001) axis. The
sector zoning appears related to the positive and negative rhomb orientations
and may have potential therefore for indicating dauphiné twinning.
Note that the true trigonal symmetry at the very centre has been replaced
quickly by a pseudo-hexagonal symmetry throughout much of the grain.
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Example
of SEM cathodoluminescence
Microgeodynamics
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