while drilling some wells always get confusion between kaolin an anhydrite as it came in same color.
i consider as kaolin due to environment comes sometime with clastic rocks, which not agree by client and but anhydrite.
even when you put HCL test and heat the sample no crystals shape form.
Michael Issigonis
Kaolin clay is very soft and can be molded and shaped when wet. No visible crystals. Anhydrite is found with halite and gypsum and has small visible crystals.
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