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Galena on Sphalerite

#PD37855

Galena on Sphalerite

#PD37855
Availability
Sold
Size
11 x 10 x 5.5 cm - Cabinet 
Formula
PbS (RRUFF)
Locality
Black Jack mine, Galena, Jo Daviess Co., Illinois, United States
Tagged
sulfide

This is a cool specimen. You probably won't see a good one like this from Galena, Illinois again. The crystals, though with a dull luster, are smooth, sharp and well defined. It is a spectacular ore example from this old American deposit. The only problem with it is a gash in the crystals off to the right in the photos. The matrix is solid Sphalerite. The backside is a plate composed of tiny white Dolomite crystals, Pyrite, and 3-5mm yellow Sphalerite crystals (photos). The DuFoe label states that Smithsonite and Wurtzite can also be found on this specimen. I don't see it, and I belive they mistook the nice yellow Sphalerite for Wurtzite. The label states circa 1969.

The history of this large district, which extends into Wisconsin and Iowa, dates back to 1845. Mining in this district peaked in 1916 during World War I and is said to have had the longest recorded production history in the United States. A good article on MVT deposits can be found in Rocks & Minerals, v64 n1 1989 by Rayond Lasmanis. Much of the information in this Special Edition was found in this excellent article.

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
Phillips Collection
Mineralpedia
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On Dakota Matrix
Previously Sold Galena
On Dakota Matrix
Other Available Galena
WebMineral
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