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  • Nacrite Al 2Si 2O 5(OH)4 is a clay mineral that is a polymorph (or polytype) of kaolinite. Nacrite was first described in 1807 for an occurrence in Saxony, Germany. — “Nacrite - Wikipedia, the free encyclopedia”,
  • It has the same composition as kaolinite, nacrite, and halloysite, but with a different crystal structure (polymorph) · Dickite · Halloysite · Illite · Ilmenite · Kaolinite · Montmorillonite · Nacrite · Nontronite · Palygorskite · Saponite · Sepiolite · Serpentine 1. — “Dickite - Wikipedia, the free encyclopedia”,
  • [Kaolin] group which includes the minerals [kaolinite] , [dickite] , [halloysite] and [nacrite] (polymorphs of Al2Si2O5(OH)4).Amethyst Galleries. [Illite] group which includes the clay-micas. Illite is the only common mineral. — “Wikipedia”,


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