prov:value
| - Examples of suitable types of clay are smectite types of clay, such as montmorillonite, saponite, beidellite, hectorite, nontronite, volkonskoite, pyroysite, sauconite, magadiite, kenyaite and stevensite; vermiculite types of clay such as trioctaedral vermiculite and dooctaedral vermiculite; and micas, such as muscovite, phlogopite, biotite, lepidolite, paragonite and tetrasilicic.
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