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Quadridavyne: (Na,K)6Ca2Al6Si6O24Cl4
Comments: Colorless hexagonal crystals of quadridavyne. Location: Ettringer Bellerberg, Ettringen, near Mayen, Eifel Mts, Rhineland-Palatinate, Germany. Scale: Picture size 3 mm. © Thomas Witzke / Abraxas-Verlag