Prehnite ("casts" after Anhydrite)

Item Description

These "casts" are well known from New Jersey, as they are some of the most distinctive Prehnites in the world. The specimens formed as the Prehnite covered preexisting crystals of Anhydrite, which eventually was dissolved away, leaving the hollow Prehnite "casts", which formed in attractive "fingers". This piece is a lovely small cabinet sized display specimen featuring semi-vitreous, beautiful green color "fingers" of Prehnite, and when you flip it over, you can clearly see the "casts" of the fomer Anhydrite crystal. It should be noted that the term "cast" is used in place of the term epimorph, which I have been told is now incorrect, and this particular phenomenon should be called a perimorph. Maybe it will catch on, but it's easier to call them "casts" for now. The color is a bit more or less green depending upon the light in which it is viewed. Under halogen lighting, it shows a lighter hue, but under fluorescent lighting, the green color is stronger. A really cool and eye-catching specimen from this historic discovery at the Prospect Park Quarry. It must be noted that this locality is essentially defunct, and will sadly no longer produce specimens like these.