Jeremejevite is an uncommon aluminum fluoroborate found in granitic pegmatites. Some samples have a
strong pleochroism from blue to colorless.
Image of the Jeremejevite absorption spectrum
GRR 1557 spectrum, 4K;
from Namibia. Plotted as 1.167 mm thick. The color of this material
comes from Fe2+ - Fe3+ intervalence charge transfer.
Data Files: E perp c 19K;
E||c 20K
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