Lazulite Visible Spectra (350 - 1050 nm)
Image of the lazulite absorption spectrum
GRR 571 spectrum, 5K; from Graves Mountain,
Georga, USA. 0.092 mm thick sample. The intense blue color of this material comes from
the Fe2+ - Fe3+ intervalence charge transfer.
It varies considerably with the direction in which it is observed. It is
blue when polarized along the b and
g directions (~a and b axes) and is colorless when parallel to
a (~c-axis). The g direction (not
shown) is nearly identical to the b direction.
Data Files: alpha 6K;
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