Nacrite

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.

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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.

References

• Mindat Data sheet
• Webmineral data