Apophyllite Group : AB4[Si8O22]X · 8H2O
Natrolite : Na2Al2Si3O10·2H2O
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“Apophyllite crystal of about 7 mm on Natrolite. This is most likely a specimen from prior to 1960. Zeolite collection of Volker Betz.”
Volker Betz - 1st April 2010
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