Here we have a pastel-green Prehnite cast after Anhydrite where the original anhydrite crystal has completely vanished, leaving the hollow prehnite behind. These are old specimens, mid-1900s mainly, and this is a SUPER example in large size of the style. It is pristine and complete all around the termination, not broken at the tips as most are. It has a really nice pastel hue in person, that is somewhat pale in the photos. Also, it is nice and sparkly, very pretty.