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Bellbergite: (K,Ba,Sr)2Sr2Ca2(Ca,Na)4Al18Si18O72·30(H2O)
Comments: Small colorless to white hexagonal crystals of bellbergite on matrix. Location: Ettringer Bellerberg, Ettringen, near Mayen, Eifel Mts, Rhineland-Palatinate, Germany. Scale: Picture size 1 mm. © Thomas Witzke / Abraxas-Verlag