It is hard to obtain specimens from the old mines of Wisconsin mined in the early 1900's. The Blackstone was also mined in the 1950's, when this specimen probably surfaced. This is a great specimen personally collected by Robert Waidler in his early days. The specimen is basically corroded Galena cubes to 1.3cm. There is a ball on the far left of the first photo, which is a large 2cm round aggregate of 1-2mm black to dark green Sphalerite crystals. At first I thought this was Marcasite, but visual examination ruled that out. It is a very fine specimen from this early lead producer of upper Mississippi Valley Type deposit.