Page 7 - Shimadzu RF-6000
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Chemicals
Potential for Identifying the Source of Minerals
Calcite is a clear and colorless mineral consisting primarily of lime
rock. Any impurities in the calcite may cause coloration. This example Calcite A
shows 3D fluorescence measurement (Excitation vs Emission) data for
three types of calcite. Calcite A and B are clear and yellow whereas
calcite C is clear and pink. 3D fluorescence patterns of calcite A and B
were the same. In contrast, on the 3D fluorescence patterns of calcite
C, there was a fluorescence peak at about 370 nm (EX; about 205
nm) and a strong fluorescence at about 430 nm (EX; about 225 nm).
This fluorescence might be caused by metal-ions such as the
manganese ion, which makes calcite pink. Because the fluorescence
wavelengths caused by metal-ions are very sensitive against the size of
the crystal field, they may readily show changes with mineral content.
Calcite B
Calcite C
RF-6000
Spectrofluorophotometer 7
