Calcium Sulfate Dihydrate
This is a calcium sulfate percipitate formed by the addition of dilute sulfuric acid to a
solution containing calcium or by the addition of dilute calcium acetate to a solution containing sulfates.
Transmitted Linear Polarized Light With a Red Plate Compensator
Significance in the Environment:
Chamot, Emile Monnin and Clyde Walter Mason, HANDBOOK OF CHEMICAL MICROSCOPY, Volume II, pp. 105-107 and 349-350, 1940.