Vote for your favorite mineral in #MinCup26! - Sphalerite vs. Anorthite
Both zinc ore Sphalerite and calcium plagioclase feldspar Anorthite have perfect cleavage that will split cleanly if you hit them with a hammer, but only one can claim a larger split of your votes!
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Montfort Mine, Montford area, Grant County, Wisconsin, USAi
Regional Level Types
Montfort MineMine
Montford areaMining Area
Grant CountyCounty
WisconsinState
USACountry
Montfort Mine, Montford area, Upper Mississippi Valley Zinc-Lead District, USA

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Latitude & Longitude (WGS84):
42° 57' 30'' North , 90° 27' 30'' West
Latitude & Longitude (decimal):
42.95833,-90.45833
GRN:
N29W48
Type:
Mine
Köppen climate type:
Dfb : Warm-summer humid continental climate
Nearest Settlements:
PlacePopulationDistance
Montfort702 (2017)2.5km
Livingston650 (2017)6.9km
Cobb463 (2017)10.5km
Castle Rock255 (2017)11.6km
Highland843 (2017)11.7km
Mindat Locality ID:
170296
Long-form identifier:
mindat:1:2:170296:8
GUID (UUID V4):
0


Mine worked intermittently between 1894 and 1906. Ore was extremely rich in iron sulfides. Mineralization was in the Decorah formation.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List


6 valid minerals.

Detailed Mineral List:

ⓘ Baryte
Formula: BaSO4
ⓘ Calcite
Formula: CaCO3
ⓘ Dolomite
Formula: CaMg(CO3)2
ⓘ Marcasite
Formula: FeS2
ⓘ Pyrite
Formula: FeS2
ⓘ Sphalerite
Formula: ZnS

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
ⓘSphalerite2.CB.05aZnS
ⓘPyrite2.EB.05aFeS2
ⓘMarcasite2.EB.10aFeS2
Group 5 - Nitrates and Carbonates
ⓘCalcite5.AB.05CaCO3
ⓘDolomite5.AB.10CaMg(CO3)2
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
ⓘBaryte7.AD.35BaSO4

List of minerals for each chemical element

CCarbon
Cⓘ CalciteCaCO3
Cⓘ DolomiteCaMg(CO3)2
OOxygen
Oⓘ BaryteBaSO4
Oⓘ CalciteCaCO3
Oⓘ DolomiteCaMg(CO3)2
MgMagnesium
Mgⓘ DolomiteCaMg(CO3)2
SSulfur
Sⓘ BaryteBaSO4
Sⓘ MarcasiteFeS2
Sⓘ PyriteFeS2
Sⓘ SphaleriteZnS
CaCalcium
Caⓘ CalciteCaCO3
Caⓘ DolomiteCaMg(CO3)2
FeIron
Feⓘ MarcasiteFeS2
Feⓘ PyriteFeS2
ZnZinc
Znⓘ SphaleriteZnS
BaBarium
Baⓘ BaryteBaSO4

Other Databases

Link to USGS MRDS:10159369

Other Regions, Features and Areas containing this locality

North AmericaContinent
North America PlateTectonic Plate
USA

This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

Heyl, Allen V., Agnew, Allen F., Lyons, Erwin J., Behre, Charles H., Flint, Arthur E. (1959) The Geology of the Upper Mississippi Valley Zinc-Lead District. Professional Paper 309. US Geological Survey doi:10.3133/pp309 p.188
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