These are spectra of the variety tanzanite which is colored by vandadium
Image of the zoisite absorption spectrum
GRR 1265 spectrum, 4K; from Tanzania,
normalized to 3.0 mm thick. The color of this material varies considerably
with the direction in which it is observed. It varies from greenish yellow
to deep blue to red-violet. Data Files: E||a=gamma 6K;E||b=alpha 9K;E||c=beta 9K;
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