A sizable old cabinet specimen of well-crystalized Epistilbite from the type locality. The largest crystal exceeds 2 CM which is very large for the specie and locality. There are several habits present on the specimen and crystals are both the typical colorless to white and some tiny pinks as well. Though not a truly rare mineral, Epistilbite is far less common than Stilbite with which it has some similarities. An excellent and very large specimen for this classic Icelandic location. Two earlier labels included, this was x-ray confirmed by the late Dr Joe Mandarino.
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.