Nacrite

Nacrite
Nacrite, "Frohe Hoffnung"-shaft, Wildental, Erzgebirge
General
Category	Phyllosilicates Kaolinite-serpentine group
Formula (repeating unit)	Al2Si2O5(OH)4
Strunz classification	9.ED.05
Crystal system	Monoclinic
Crystal class	Domatic (m) (same H-M symbol)
Space group	Cc

Nacrite Al₂Si₂O₅(OH)₄ is a clay mineral that is polymorphous (or polytypic) with 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.

References

• Mindat Data sheet
• Webmineral data