| http://www.w3.org/ns/prov#value | - For example, standard bentonite-sodium hydroxide-lignite-chrome lignosulfonate muds are contaminated by common minerals encountered during drilling, i.e. salt, gypsum, anhydrite or calcium carbonate, and change from a relatively free flowing slurry into a very stiff material which, in aggravated cases, can hardly be poured out of a beaker.
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