Compared to gypsum, anhydrite exhibits cleavage in three directions at right angles and has a greater hardness. I think these two can be used to distinguish anhydrite and gypsum. Nov 4, 2016 ·. Dear Mr. Abdula: It is not easy to distinguish both modifiion of Ca sulfate from each other, indeed.
How to distinguish Gypsum and Anhydrite in drill .
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