Anhydrite Visible Spectra (400 - 1000 nm)
Anhydrite, CaSO4, is ideally colorless, but can assume a violet color believed
to come from radiation damage.
Image of the anhydrite absorption spectrum
- CIT-12783 spectrum;
from the Simplon Tunnel, Switzerland plotted as 3.0 mm thick. The color
of anhydrite from this locality
can be light lavender and the intensity of the color varies
considerably with the direction in which it is observed with polarized
light. A back-lit
sample
polarized parallel to the c-axis presents the darkest
lavender color. Data
Files: E\\a;
E\\b;
E\\c.
Link
to references to visible spectroscopy of anhydrite
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revised 5-Jul-2022
polarized parallel to the c-axis presents the darkest
lavender color. Data
Files: E\\a;
E\\b;
E\\c.