Villiaumite is a simple
salt, sodium fluoride, NaF. It is can be colored a deep red due
to radiation damage from external ionizing radiation.
Image of a representative villiaumite spectrum
Villiaumite
GRR 1074 spectrum. Deep red core to the otherwise
colorless crystal from Mt. Saint Hillaire, Plotted for
1.9 mm thickness. Data File: 24 K.
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