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“Phillipsite as red colored Perrier-Twin, about 4 mm long. This was found around 1970. Gift from G. Wittmer, Wiesloch about 30 years ago. Zeolite Collection of Volker Betz.”
Volker Betz - 24th October 2010
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“Phillipsite as rare red colored Marburg-Twins. This was found around 1970. Gift from G. Wittmer, Wiesloch.”
Volker Betz - 20th September 2022
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