Heulandite crystals in a pinkish Natrolite vug from the famed collection of Robert Ferguson (1767-1840). This was obtained by John Marshall in 1998 when the collection was rediscovered and sold-off in lots. This piece, like many others, does not have a label, so some details are lost, but the collection lists pieces from Berufjordur so this given locality is a speculation. However this seems very likely as this matches specimens from here very well, and Heulandite was a new mineral in the years that Ferguson was actively collecting. Crystals reach 1.7 CM and are the typical sharp, glassy partly transparent type well-known from this region of Iceland. Some penetration twins of the prisms are distinctive. No damage.
Ex. Doug Ervin collection, Ex Collector's Edge. The mineral market is flooded with average quality trap-rock specimens, so we avoid most Indian Zeolites unless they are especially good. This one is one of those few! Perfect, undamaged, sharp, well-composed and a great example of the specie. Far better in person the esthetics are top notch.