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Mississippi Valley Type deposits

Tuesday, 31 December 2013 05:00 PM

Most mineral collections contain one, two or more specimens from the mining regions of Illinois, Ohio, Kansas, Oklahoma and even Wisconsin. The deposits are large and hosted within the giant limestone formations. This Special Edition will showcase the fabulous Galena, Fluorite and Sphalerite etc found at the these classic US mining districts.

Galena

with Dolomite - #PD37979
Locality
Sweetwater mine, Viburnum Trend, Reynolds Co., Missouri, United States 
Formula
PbS 
Availability
Sold
Size
7 x 5 x 3.5 cm - Sm Cabinet 
Tagged
sulfide  

Shiny Galena crystals to 1,5cm perched nicely on top of a matrix of limestone with white Dolomite crystals and scattered Chalcopyrite micro crystals. It is but a small example of the many thousands of Galena specimens taken out of the Viburnum trend, one of, if not, the largest lead districts in the world.


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

#PD37847
Locality
Franklin quarry, Milwaukee Co., Wisconsin, United States 
Formula
FeS2 
Availability
Sold
Size
15 x 7 x 4 cm - Cabinet 
Tagged
sulfide  

Brassy gold Marcasite crystals to 8mm on limestone matrix.This probably isn't with the reach of the Wisconsin MVT deposits, but it was fitting for the update.


Marcasite

Formula
FeS2 
Crystal System
Orthorhombic 
Crystal Habit
Tabular, Stalactitic, Globular 
Cleavage
Indistinct, None, None 
Luster
Metallic 
Color
bronze, light brass yellow, tin white 
Streak
gray brownish black 
Class
Orthorhombic - Dipyramidal 
Fracture
Uneven 
Hardness
6-6.5 
Collection
Phillips Collection
Mineralpedia
View Marcasite
On Dakota Matrix
Previously Sold Marcasite
On Dakota Matrix
Other Available Marcasite
WebMineral
View Marcasite
Mindat
View Marcasite

Marcasite

with Calcite on Galena - #PD37854
Locality
Sweetwater mine, Viburnum Trend, Reynolds Co., Missouri, United States 
Formula
FeS2 
Availability
Sold
Size
5.5 x 4.5 x 4 cm - Sm Cabinet 
Tagged
sulfide  

A nice combination specimen with a 5cm Galena crystal with an overgrowth of cockscomb Marcasite (5mm) and Calcite (1cm).


Marcasite

Formula
FeS2 
Crystal System
Orthorhombic 
Crystal Habit
Tabular, Stalactitic, Globular 
Cleavage
Indistinct, None, None 
Luster
Metallic 
Color
bronze, light brass yellow, tin white 
Streak
gray brownish black 
Class
Orthorhombic - Dipyramidal 
Fracture
Uneven 
Hardness
6-6.5 
Collection
Phillips Collection
Mineralpedia
View Marcasite
On Dakota Matrix
Previously Sold Marcasite
On Dakota Matrix
Other Available Marcasite
WebMineral
View Marcasite
Mindat
View Marcasite

Marcasite

on Fluorite - #PD37861
Locality
Cave-in-Rock, Hardin Co., Illinois, United States 
Formula
FeS2 
Availability
Sold
Size
7 x 6 x 4 cm - Sm Cabinet 
Tagged
sulfide  

Yellow Fluorite with brassy and twinned Marcasite crystals to 4mm. Ex. Scott Williams.


Marcasite

Formula
FeS2 
Crystal System
Orthorhombic 
Crystal Habit
Tabular, Stalactitic, Globular 
Cleavage
Indistinct, None, None 
Luster
Metallic 
Color
bronze, light brass yellow, tin white 
Streak
gray brownish black 
Class
Orthorhombic - Dipyramidal 
Fracture
Uneven 
Hardness
6-6.5 
Collection
Phillips Collection
Mineralpedia
View Marcasite
On Dakota Matrix
Previously Sold Marcasite
On Dakota Matrix
Other Available Marcasite
WebMineral
View Marcasite
Mindat
View Marcasite

Sphalerite

with Marcasite - #PD37844
Locality
Shullsburg, Lafayette Co., Wisconsin, United States 
Formula
ZnS 
Availability
Sold
Size
8.5 x 7 x 3.5 cm - Sm Cabinet 
Tagged
sulfide  

Brassy colored Marcasite in larger colloform-like habit with a fractured Sphalerite crystal cluster at the top. The Sphalerite contains open vugs with micro Pyrite crystals.


Sphalerite

Formula
ZnS 
Crystal System
Isometric 
Crystal Habit
Euhedral Crystals, Granular, Colloform 
Cleavage
Perfect, Perfect, Perfect 
Luster
Resinous - Greasy 
Color
brown, yellow, red, green, black 
Streak
brownish white 
Class
Isometric - Hextetrahedral 
Fracture
Uneven 
Hardness
3.5-4 
Collection
Phillips Collection

Sphalerite

with Quartz, Fluorite - #PD37850
Locality
Rosiclare, Hardin Co., Illinois, United States 
Formula
ZnS 
Availability
Sold
Size
8.5 x 5 x 5 cm - Sm Cabinet 
Tagged
sulfide  

Deep red Sphalerite crystals to 3mm. The blades look like Baryte and perhaps were at one time, but were totally replaced (?) by micro Quartz crystals. Minor Calcite and Fluorite on the backside.


Sphalerite

Formula
ZnS 
Crystal System
Isometric 
Crystal Habit
Euhedral Crystals, Granular, Colloform 
Cleavage
Perfect, Perfect, Perfect 
Luster
Resinous - Greasy 
Color
brown, yellow, red, green, black 
Streak
brownish white 
Class
Isometric - Hextetrahedral 
Fracture
Uneven 
Hardness
3.5-4 
Collection
Phillips Collection

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