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Mount Carroll Quarry, Mount Carroll, Carroll Co., Illinois, USAi
Regional Level Types
Mount Carroll QuarryQuarry
Mount CarrollMountain
Carroll Co.County
IllinoisState
USACountry

This page kindly sponsored by Ed Clopton
Key
Latitude & Longitude (WGS84):
42° 5' 3'' North , 90° 1' 47'' West
Latitude & Longitude (decimal):
Locality type:
Nearest Settlements:
PlacePopulationDistance
Mount Carroll1,620 (2017)4.4km
Savanna2,880 (2017)10.5km
Sabula552 (2017)12.0km
Chadwick526 (2017)14.0km
Thomson562 (2017)15.1km


Dolostone quarry west of Mount Carroll, Illinois, located immediately north of Illinois Route 64/U.S. Route 52, 2 1/2 miles west of the intersection with Illinois Route 78.

The quarry exploits the Wise Lake and overlying Dubuque formation of the Ordovician-age Galena Group. The Wise Lake consists of hard, dense, light grey dolostone with scattered small mineralized vugs (mostly mm-size marcasite and pyrite on minute sparkling white rhombs of dolomite; sphalerite, galena, and barite are less common). The Dubuque consists of softer, darker, yellower dolostone with more, larger mineralized vugs (cm-size marcasite, pyrite, sphalerite, yellow barite, and galena; calcite, smithsonite, and cerussite? are rare) and occasional petroluem-filled cavities. The Ordovician-age Maquoketa Shale is present as overburden.

Marcasite from Mt. Carroll appears to be relatively stable, with no deterioration noted as yet (2015) in dozens of specimens collected by E. L. Clopton in the 1980s and 90s and subjected to seasonal extremes of humidity and dryness since then. Several specimens of Mt. Carroll pyrite, however, have deteriorated.

Regions containing this locality

North America PlateTectonic Plate

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


8 valid minerals.

Detailed Mineral List:

Baryte
Formula: BaSO4
Reference: E. L. Clopton
Calcite
Formula: CaCO3
Reference: E. L. Clopton collection
Dolomite
Formula: CaMg(CO3)2
Reference: Econ Geol (1989) 84:2139-2154
Galena
Formula: PbS
Reference: Econ Geol (1989) 84:2139-2154
Marcasite
Formula: FeS2
Reference: Econ Geol (1989) 84:2139-2154
Pyrite
Formula: FeS2
Reference: Richards, R. Peter; Clopton, Edwin L; Jaszczak, John A; in Mineralogical Record, Mar 1995. ; Econ Geol (1989) 84:2139-2154
Smithsonite
Formula: ZnCO3
Reference: E. L. Clopton collection
Sphalerite
Formula: ZnS
Reference: Econ Geol (1989) 84:2139-2154

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Galena2.CD.10PbS
Marcasite2.EB.10aFeS2
Pyrite2.EB.05aFeS2
Sphalerite2.CB.05aZnS
Group 5 - Nitrates and Carbonates
Calcite5.AB.05CaCO3
Dolomite5.AB.10CaMg(CO3)2
Smithsonite5.AB.05ZnCO3
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Baryte7.AD.35BaSO4

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmXp, with m:p = 1:1
Galena2.8.1.1PbS
Sphalerite2.8.2.1ZnS
AmBnXp, with (m+n):p = 1:2
Marcasite2.12.2.1FeS2
Pyrite2.12.1.1FeS2
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Smithsonite14.1.1.6ZnCO3
AB(XO3)2
Dolomite14.2.1.1CaMg(CO3)2
Group 28 - ANHYDROUS ACID AND NORMAL SULFATES
AXO4
Baryte28.3.1.1BaSO4

List of minerals for each chemical element

CCarbon
C DolomiteCaMg(CO3)2
C SmithsoniteZnCO3
C CalciteCaCO3
OOxygen
O DolomiteCaMg(CO3)2
O BaryteBaSO4
O SmithsoniteZnCO3
O CalciteCaCO3
MgMagnesium
Mg DolomiteCaMg(CO3)2
SSulfur
S PyriteFeS2
S MarcasiteFeS2
S GalenaPbS
S SphaleriteZnS
S BaryteBaSO4
CaCalcium
Ca DolomiteCaMg(CO3)2
Ca CalciteCaCO3
FeIron
Fe PyriteFeS2
Fe MarcasiteFeS2
ZnZinc
Zn SphaleriteZnS
Zn SmithsoniteZnCO3
BaBarium
Ba BaryteBaSO4
PbLead
Pb GalenaPbS

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Economic Geology (1989): 84: 2139-2154.
Richards, R. P., Clopton, E. L., Jaszczak, J. A. (1995). Pyrite and marcasite intergrowths from northern Illinois. Mineralogical Record: 26(2):129-138.
Willman, H. B., Kolata, D. R. (1978). The Platteville and Galena groups in northern Illinois. Illinois State Geological Survey Circular 502. Urbana, Illinois: Illinois State Geological Survey.


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