"Gyp" water is for many people the only means of acquaintance with gypsum. A grayish deposit in the tea kettle and the difficulties encountered when "gyp" water is used for laundering do not serve as a fitting introduction to the beautiful alabaster of the Taj Mahal. For alabaster is gypsum, too. There are still other forms of gypsum which are making this mineral increasingly important.
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Whitsitt, May L.
"Gypsum - Its Value To Texas,"
Field and Laboratory: Vol. 4
Available at: https://scholar.smu.edu/fieldandlab/vol4/iss1/5