Nacrite

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Nacrite
Nacrite - Mineralogisches Museum Bonn1.jpg
Nacrite, "Frohe Hoffnung"-shaft, Wildental, Erzgebirge
General
Category Phyllosilicates
Kaolinite-serpentine group
Formula
(repeating unit)
Al2Si2O5(OH)4
Strunz classification 09.ED.05
Identification
Crystal system Monoclinic

Nacrite Al2Si2O5(OH)4 is a clay mineral that is a polymorph (or polytype) of kaolinite. It crystallizes in the monoclinic system. X-ray diffraction analysis is required for positive identification.

Nacrite was first described in 1807 for an occurrence in Saxony, Germany. The name is from nacre in reference to the mother of pearl luster of nacrite masses.

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