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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.

SOLD
Alstonite - PD36877
Alstonite - PD36877

Alstonite

with Fluorite - #PD36877
Locality
Rosiclare, Hardin Co., Illinois, United States 
Formula
BaCa(CO3)2 
Availability
Sold
Size
2.5 x 2 x 1.5 cm - Thumbnail 
Tagged
carbonate  

Thumbnail size specimen of very rare Alstonite as sharp white, rice-shaped crystals to 2mm. On the side of this specimen is a vug with a yellow Fluorite crystal and thousands of colorless, perfectly terminated Alstonite crystals.


Alstonite

Formula
BaCa(CO3)2 
Crystal System
Triclinic 
Crystal Habit
Euhedral Crystals, Pseudo Hexagonal 
Cleavage
Imperfect, None, None 
Luster
Vitreous (Glassy) 
Color
colorless, gray, white, pink 
Streak
white 
Class
Triclinic 
Fracture
Uneven 
Hardness
4-4.5 
Collection
Phillips Collection
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Anglesite

on Galena - #PD37858
Locality
Bear Hole mine, Shullsburg, Lafayette Co., Wisconsin, United States 
Formula
PbSO4 
Availability
Sold
Size
6 x 5.5 x 5 cm - Sm Cabinet 

A most interesting specimen once you start looking at it through the microscope as it is thoroughly covered by excellent yellow stained Anglesites to 2mm. The bulk of course is Galena, a corroded crystals of historic origin no doubt. The Shullsburg area was once littered with underground lead mines all of which were MVT style mineralization.


Anglesite

Formula
PbSO4 
Crystal System
Orthorhombic 
Crystal Habit
Granular, Stalactitic 
Cleavage
Good, Distinct, None 
Luster
Adamantine 
Color
blue, colorless, green, gray, yellow 
Streak
white 
Class
Orthorhombic - Dipyramidal 
Fracture
Brittle - Conchoidal 
Hardness
2.5-3 
Collection
Phillips Collection
Mineralpedia
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On Dakota Matrix
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On Dakota Matrix
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Anglesite

#37964
Locality
Touissit dist., Oujda-Angad prov., Oriental, Morocco 
Formula
PbSO4 
Availability
Sold
Size
2 x 1.5 x 1.5 cm - Thumbnail 

Gemmy amber colored wedge-shaped crystals to 1cm in a cluster of at least 10 crystals. The mines of Touissit were recently covered in an article in the Nov/Dec 2013 issue on the Mineralogical Record by Steffen Jahn and Rainer Bode. Of course the Anglesite from this locality were found in much larger crystals in the early 1980's to 5cm. Some of the crystals were treated (accidentally or on purpose) to bring out the color. This specimen was NOT treated as can be seen in a small chip off the crystal at the bottom, which internally shows the same color.

The mines around Touissit are classified by geologists as Mississippi Valley Type. As in the mines of Illinois, Kentucky and Tennessee, the Touissit district contain large mineable lead-zinc replacement deposits hosted within dolomite beds. Concentrations of ore are located along structured and are also stratigraphically controlled. In contrast to the US midwest MVT deposits, the Touissit deposits are fluorine deficient.


Anglesite

Formula
PbSO4 
Crystal System
Orthorhombic 
Crystal Habit
Granular, Stalactitic 
Cleavage
Good, Distinct, None 
Luster
Adamantine 
Color
blue, colorless, green, gray, yellow 
Streak
white 
Class
Orthorhombic - Dipyramidal 
Fracture
Brittle - Conchoidal 
Hardness
2.5-3 
Collection
Waldner Collection
Mineralpedia
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Baryte

#DH36084
Locality
Rosiclare, Hardin Co., Illinois, United States 
Formula
BaSO4 
Availability
Sold
Size
12 x 11 x 6 cm - Cabinet 
Special Info
Fluorescent 

A large plate loaded with 1-2cm steeply terminated glossy white Baryte crystals. Fluorescent yellow.


Baryte

Formula
BaSO4 
Crystal System
Orthorhombic 
Crystal Habit
Tabular, Prismatic, Massive - Fibrous 
Cleavage
Perfect, Perfect, Imperfect 
Luster
Vitreous (Glassy) 
Color
white, yellowish white, grayish white, brownish white, dark brown 
Streak
white 
Class
Orthorhombic - Dipyramidal 
Fracture
Uneven 
Hardness
3-3.5 
Collection
Hess Collection
Special Info
Fluorescent
Mineralpedia
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Calcite

on Fluorite - #PD37849
Locality
Denton mine, Hardin Co., Illinois, United States 
Formula
CaCO3 
Availability
Sold
Size
15 x 10 x 8 cm - Cabinet 
Tagged
carbonate  

Large specimen of mostly purple Fluorite with 8cm scalenohedral Calcite crystals. The Fluorite is etched att he base but the backside is well-crystallized. Minor scuffing.


Calcite

Formula
CaCO3 
Crystal System
Trigonal 
Crystal Habit
Crystalline - Coarse, Stalactitic, Massive 
Cleavage
Perfect, Perfect, Perfect 
Luster
Vitreous (Glassy) 
Color
colorless, white, pink, yellow, brown 
Streak
white 
Class
Trigonal - Hexagonal Scalenohedral 
Fracture
Brittle - Conchoidal 
Hardness
Collection
Phillips Collection
Mineralpedia
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On Dakota Matrix
Previously Sold Calcite
On Dakota Matrix
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Calcite

with Marcasite - #PD37856
Locality
Sweetwater mine, Viburnum Trend, Reynolds Co., Missouri, United States 
Formula
CaCO3 
Availability
Sold
Size
12 x 9 x 5.5 cm - Cabinet 
Tagged
carbonate  

This is a beaut...with honey yllow, lustrous "nail-ead" terminated crystals all to about 3cm long. There is only one cleaved off and it's in the backside, else in good conition.


Calcite

Formula
CaCO3 
Crystal System
Trigonal 
Crystal Habit
Crystalline - Coarse, Stalactitic, Massive 
Cleavage
Perfect, Perfect, Perfect 
Luster
Vitreous (Glassy) 
Color
colorless, white, pink, yellow, brown 
Streak
white 
Class
Trigonal - Hexagonal Scalenohedral 
Fracture
Brittle - Conchoidal 
Hardness
Collection
Phillips Collection
Mineralpedia
View Calcite
On Dakota Matrix
Previously Sold Calcite
On Dakota Matrix
Other Available Calcite
WebMineral
View Calcite
Mindat
View Calcite

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