I collected with Mark in the 1980s We loved to go to Franklin and dig willemite and other fluorescent minerals. I bought a number of excellent N.J. zeolite which are on display at the Morris Museum in Morristown. Stilbite, Heulandite were collected by Mark. I was the Curator of Geology back then. Last time I saw him was in Tucson. I loved the person that Mark was… Nick Rochester