Merelani Prehnite is considered by many, including me, to be the best in the world, and what has been produced in the last year or two has been the best. This beautiful specimen is a perfect example of this quality. Large translucent crystals with good yellow color in a somewhat flower-like rosette formation. It's undamaged and formed atop a (now gone) Tanzanite crystal and only tiny bits of Tanzanite remain on the base.