Faujasite-Ca crystal ca. 1.5 mm with black coating. This sample is from a 2005 find (loose 20 cm boulder in quarry II) containg relative large crystals, coated and non-coated. One crystal was analysed by Klaus Behlendorff. He found Ca++ as the main cation, also containing Na+ and Mg++.
Zeolite Collection of Volker Betz.
Zeolite Collection of Volker Betz.
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Photo added: 18th Nov 2006