Gypsum CaSO
42H
2O Monoclinic
o Low-T aqueous environment. (chapters 13 and 18)
- Microscopic view (XP) of selenite gypsum cleavage fragment (2.5 mm) lying on the perfect {010} cleavage in mineral oil on a glass slide. The birefringence of gypsum in this orientation in a standard 30 micron thick thin section generates 1st order yellow interference color. First order yellow in this fragment view occurs only along the upper left edge. Colors increase through red, blue, green, to 2nd order yellow (crystal center) as thickness increases, where cleavage fragments have been broken away along other cleavage directions from the {010} cleavage.
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