http://www.mindat.org/u-1061.html The mindat.org user blog written by Volker Betz http://www.mindat.org/article.php/376/Mineral+Photography Fri, 02 Jan 2009 Published: Fri, 02 Jan 2009, Subject: Mineral Photography http://www.mindat.org/article.php/342/+Volker+Betz+-+Zeolites+and+other+Minerals+for+Exchange Thu, 01 Jan 2009 Published: Thu, 01 Jan 2009, Subject: Volker Betz - Zeolites and other Minerals for Exchange http://www.mindat.org/article.php/293/Zeolites+from+Lanzarote Sun, 15 Jun 2008 Published: Sun, 15 Jun 2008, Subject: Zeolites from Lanzarote