Lazulite Visible Spectra (350 - 1050 nm)
Lazulite, MgAl2(PO4)2(OH)2, is blue because iron can replace both Mg and Al in the crystal.
Image of the lazulite absorption spectrum
-
GRR 571
spectrum; 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;
beta ;
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