St. Andreasberg, Harz Mountains, Lower Saxony, Germany (TYPE LOCALITY)
Cabinet, 10.8 x 10.6 x 3.9 cm
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A remarkably large plate of this rare zeolite group member, hosting hundreds of sharp crystals. This is the type locality for the species, from 1801, and this specimen would surely date to the 1800s. Many crystals, to 5 or 6mm, are cyclic-twinned.