Harmotome (11 mm)
(Ba0,5,Ca0,5,K,Na)5[Al5Si11O32].12H2O
St. Andreasberg, Harz, Germany
Coll. and Photo © Volker Betz, Zeolites website
Harmotome, Andreasberg, Harz, Germany
Victor Goldschmidt, Atlas der Kristallformen,
Band 4, Tafel78, Fig. 51