Piemontite Spectrum
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Thin section of Piemontite from Laponia,
Sweden. The 4 micrographs below illustrate the beautiful pleochroism of
Piemontite, an epidote containing Mn3+, from yellow to pink,
red and brown. In the spectra at the bottom of this page, the 3 peaks in the visible region originate from the crystal fields transitions of Mn3+ in distorted octahedral site. The red curve is α spectrum (yellow crystals) and the blue curve is β spectrum. The small forbidden transitions superimposed to the main peaks could be due to Fe3+. |
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