PREHNITE.(crystal mineral) Rocks & Minerals | May 1, 1999| | COPYRIGHT 1999 Heldref Publications. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan.  All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information) Copyright

Brandberg, Namibia

Mafic lava flows have long supplied wonderful specimens of zeolite and related minerals. Localities of this type in New Jersey and neighboring states provided consistently productive collecting sites for some of America's first mineralogists, and a number of these quarries or their modern equivalents continue to produce to this day. Consequently, most collectors are familiar with prehnite, typically as pale green botryoidal or reniform masses often associated with apophyllite, natrolite, chabazite, and stilbite and commonly bearing labels ...

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