A unique, old-time Cornwall specimen with a fabulous provenance. The piece is solid, metallic-gray bright jamesonite microcrystals. Cornwall is the Type Locality for jamesonite, but massive jamesonite specimens, such as this are rare. The beautifully handwritten label indicates that this classic specimen was personally collected by Sir Arthur Russell on the dumps of this much less well-known mine in 1906. Ex. Mullane Collection.