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Galena with Sphalerite

#RW48133
SOLD
Galena from Blackstone mine, Shullsburg, Lafayette Co., Wisconsin, United States - RW48133
Galena from Blackstone mine, Shullsburg, Lafayette Co., Wisconsin, United States - RW48133

Galena with Sphalerite

#RW48133
Availability
Sold
Size
9 x 6 x 3.5 cm - Sm Cabinet 
Formula
PbS (RRUFF)
Locality
Blackstone mine, Shullsburg, Lafayette Co., Wisconsin, United States
Tagged
sulfide

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. 

Galena

Formula
PbS 
Crystal System
Isometric 
Crystal Habit
Euhedral Crystals, Massive - Granular, Massive 
Cleavage
Perfect, Perfect, Perfect 
Luster
Metallic 
Color
light lead gray, dark lead gray 
Streak
grayish black 
Class
Isometric - Hexoctahedral 
Fracture
Brittle 
Hardness
2.5 

Data courtesy of Webmineral.

Collection
Robert J. Waidler Collection
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