Thomsenolite and pachnolite are very rare halides and this old-time, very rich, showy and excellent specimen hails from the Type Locality for both species - the Cryolite Deposit, Ivigtut, Greenland. A multi-sided vug in matrix is filled with stepped, white thomsenolite crystals, which are in turn, richly covered with prismatic microcrystals of pachnolite, a dimorph of thomsenolite. Most of the crystals are oxide-coated, which adds a very nice contrast. Probably mined around 1900. Ex. George Elling Collection.