A spectacular array of contrasting colorful crystals of Heulandite and Stilbite on Blue Chalcedony in the natural void in volcanic Basalt they formed in. An expert extraction of this fine mineral specimen created a window into as it was in nature. A small side opening provides amazing, unique lighting and presentation opportunities! Nasik, Maharashtra, India. 4.75" x 2.75" x 3.5", 1 lb, 11 oz.