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Black River pegmatite, Republic, Marquette Co., Michigan, USA

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Latitude & Longitude (WGS84): 46° 27' 23'' North , 87° 57' 9'' West
Latitude & Longitude (decimal): 46.45639,-87.95250
GeoHash:G#: f032q94un
Locality type:Pegmatite
Köppen climate type:Dfb : Warm-summer humid continental climate


A pegmatite in the Archean Southern Complex Gneiss. The exposure is a small dome cut by an old railroad bed, now a snowmobile trail, located about 500 m west of highway M-95, a few miles north of the village of Republic. The pegmatite is noted for purple and yellow-green, anhedral masses of fluourite which contain rare-earth minerals. The pegmatite is most easily sampled from the boulders that were blasted out of the cut and now languish in the thickets a few paces to the north and west of the cut. Each appears to have been vigorously pecked at by rockhounds past.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


20 valid minerals.

Rock Types Recorded

Note: this is a very new system on mindat.org and data is currently VERY limited. Please bear with us while we work towards adding this information!

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

Allanite-(Ce)
Formula: {CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
Reference: Buchholz, T.W., Falster, A.U. and Simmons, W.B. (2013) Accessory mineralogy of the Black River pegmatite and Humboldt granite, Marquette County, Michigan. The 40th Rochester Mineralogical Symposium, Contributed Papers in Specimen Mineralogy, 9-10.
'Betafite Group'
Formula: A2(Ti,Nb)2O6Z
Reference: Buchholz, T.W., Falster, A.U. and Simmons, W.B. (2013) Accessory mineralogy of the Black River pegmatite and Humboldt granite, Marquette County, Michigan. The 40th Rochester Mineralogical Symposium, Contributed Papers in Specimen Mineralogy, 9-10.
Britholite-(Y)
Formula: (Y,Ca)5(SiO4)3OH
Description: Microcrystals within anhedral fluorite
Reference: "Mines and Minerals of Michigan's Iron Country," Ramon S. Demark. Rocks & Minerals, March 2000.
Calcite
Formula: CaCO3
Reference: Buchholz, T.W., Falster, A.U. and Simmons, W.B. (2013) Accessory mineralogy of the Black River pegmatite and Humboldt granite, Marquette County, Michigan. The 40th Rochester Mineralogical Symposium, Contributed Papers in Specimen Mineralogy, 9-10.
Chalcopyrite
Formula: CuFeS2
Reference: Buchholz, T.W., Falster, A.U. and Simmons, W.B. (2013) Accessory mineralogy of the Black River pegmatite and Humboldt granite, Marquette County, Michigan. The 40th Rochester Mineralogical Symposium, Contributed Papers in Specimen Mineralogy, 9-10.
Columbite-(Fe)
Formula: FeNb2O6
Reference: Columbite-(Fe): analyzed by George Robinson of Michigan Tech 2009
Fluorite
Formula: CaF2
Habit: anhedral masses
Colour: purple, yellow-green
Reference: "Mines and Minerals of Michigan's Iron Country," Ramon S. Demark. Rocks & Minerals, March 2000.
Grayite
Formula: (Th,Pb,Ca)(PO4) · H2O
Reference: Buchholz, T.W., Falster, A.U. and Simmons, W.B. (2013) Accessory mineralogy of the Black River pegmatite and Humboldt granite, Marquette County, Michigan. The 40th Rochester Mineralogical Symposium, Contributed Papers in Specimen Mineralogy, 9-10.
Malachite
Formula: Cu2(CO3)(OH)2
Reference: Buchholz, T.W., Falster, A.U. and Simmons, W.B. (2013) Accessory mineralogy of the Black River pegmatite and Humboldt granite, Marquette County, Michigan. The 40th Rochester Mineralogical Symposium, Contributed Papers in Specimen Mineralogy, 9-10.
Microcline
Formula: K(AlSi3O8)
Reference: Mineralogy of Michigan (2004) Heinrich & Robinson
'Microlite Group'
Formula: A2-mTa2X6-wZ-n
Reference: Buchholz, T.W., Falster, A.U. and Simmons, W.B. (2013) Accessory mineralogy of the Black River pegmatite and Humboldt granite, Marquette County, Michigan. The 40th Rochester Mineralogical Symposium, Contributed Papers in Specimen Mineralogy, 9-10.
Monazite-(Ce)
Formula: Ce(PO4)
Reference: Monazite-(Ce): Analysis performed by Shawn Carlson(Geologist, Michigan Technological University alumnis) 2009
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Habit: Thick books, several cm in length
Reference: Dave Maietta - Collection
'Pegmatite'
Reference: U.S. Geological Survey, (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Pyrite
Formula: FeS2
Reference: Buchholz, T.W., Falster, A.U. and Simmons, W.B. (2013) Accessory mineralogy of the Black River pegmatite and Humboldt granite, Marquette County, Michigan. The 40th Rochester Mineralogical Symposium, Contributed Papers in Specimen Mineralogy, 9-10.
'Pyrochlore'
Reference: Buchholz, T.W., Falster, A.U. and Simmons, W.B. (2013) Accessory mineralogy of the Black River pegmatite and Humboldt granite, Marquette County, Michigan. The 40th Rochester Mineralogical Symposium, Contributed Papers in Specimen Mineralogy, 9-10.
Quartz
Formula: SiO2
Reference: Mineralogy of Michigan (2004) Heinrich & Robinson
Synchysite-(Ce) ?
Formula: CaCe(CO3)2F
Reference: Buchholz, T.W., Falster, A.U. and Simmons, W.B. (2013) Accessory mineralogy of the Black River pegmatite and Humboldt granite, Marquette County, Michigan. The 40th Rochester Mineralogical Symposium, Contributed Papers in Specimen Mineralogy, 9-10.
Synchysite-(Y)
Formula: CaY(CO3)2F
Reference: Buchholz, T.W., Falster, A.U. and Simmons, W.B. (2013) Accessory mineralogy of the Black River pegmatite and Humboldt granite, Marquette County, Michigan. The 40th Rochester Mineralogical Symposium, Contributed Papers in Specimen Mineralogy, 9-10.
Tanteuxenite-(Y)
Formula: Y(Ta,Nb,Ti)2(O,OH)6
Reference: Buchholz, T.W., Falster, A.U. and Simmons, W.B. (2013) Accessory mineralogy of the Black River pegmatite and Humboldt granite, Marquette County, Michigan. The 40th Rochester Mineralogical Symposium, Contributed Papers in Specimen Mineralogy, 9-10.
Thorite ?
Formula: Th(SiO4)
Reference: Buchholz, T.W., Falster, A.U. and Simmons, W.B. (2013) Accessory mineralogy of the Black River pegmatite and Humboldt granite, Marquette County, Michigan. The 40th Rochester Mineralogical Symposium, Contributed Papers in Specimen Mineralogy, 9-10.
Topaz
Formula: Al2(SiO4)(F,OH)2
Reference: Shawn M. Carlson, Cristiana Mircea (2010) Do Michigan Pegmatites Contain Topaz Crystals? Yes, They Do! Mineral News February 2010: 13-14.
Xenotime-(Y)
Formula: Y(PO4)
Description: Yb-rich. Microcrystals within anhedral fluorite
Reference: "Mines and Minerals of Michigan's Iron Country," Ramon S. Demark. Rocks & Minerals, March 2000.
Zircon
Formula: Zr(SiO4)
Reference: Buchholz, T.W., Falster, A.U. and Simmons, W.B. (2013) Accessory mineralogy of the Black River pegmatite and Humboldt granite, Marquette County, Michigan. The 40th Rochester Mineralogical Symposium, Contributed Papers in Specimen Mineralogy, 9-10.

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
'Chalcopyrite'2.CB.10aCuFeS2
'Pyrite'2.EB.05aFeS2
Group 3 - Halides
'Fluorite'3.AB.25CaF2
Group 4 - Oxides and Hydroxides
'Columbite-(Fe)'4.DB.35FeNb2O6
'Microlite Group'4.00.A2-mTa2X6-wZ-n
'Quartz'4.DA.05SiO2
'Tanteuxenite-(Y)'4.DG.05Y(Ta,Nb,Ti)2(O,OH)6
Group 5 - Nitrates and Carbonates
'Calcite'5.AB.05CaCO3
'Malachite'5.BA.10Cu2(CO3)(OH)2
'Synchysite-(Ce)' ?5.BD.20cCaCe(CO3)2F
'Synchysite-(Y)'5.BD.20cCaY(CO3)2F
Group 8 - Phosphates, Arsenates and Vanadates
'Grayite'8.CJ.45(Th,Pb,Ca)(PO4) · H2O
'Monazite-(Ce)'8.AD.50Ce(PO4)
'Xenotime-(Y)'8.AD.35Y(PO4)
Group 9 - Silicates
'Allanite-(Ce)'9.BG.05b{CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
'Britholite-(Y)'9.AH.25(Y,Ca)5(SiO4)3OH
'Microcline'9.FA.30K(AlSi3O8)
'Muscovite'9.EC.15KAl2(AlSi3O10)(OH)2
'Thorite' ?9.AD.30Th(SiO4)
'Topaz'9.AF.35Al2(SiO4)(F,OH)2
'Zircon'9.AD.30Zr(SiO4)
Unclassified Minerals, Rocks, etc.
'Betafite Group'-A2(Ti,Nb)2O6Z
'Pegmatite'-
'Pyrochlore'-

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmBnXp, with (m+n):p = 1:1
Chalcopyrite2.9.1.1CuFeS2
AmBnXp, with (m+n):p = 1:2
Pyrite2.12.1.1FeS2
Group 8 - MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
A2B2O6(O,OH,F)
'Microlite Group'8.2.2.1A2-mTa2X6-wZ-n
AB2O6
Columbite-(Fe)8.3.2.2FeNb2O6
Tanteuxenite-(Y)8.3.8.3Y(Ta,Nb,Ti)2(O,OH)6
Group 9 - NORMAL HALIDES
AX2
Fluorite9.2.1.1CaF2
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Group 16a - ANHYDROUS CARBONATES CONTAINING HYDROXYL OR HALOGEN
Synchysite-(Ce) ?16a.1.3.1CaCe(CO3)2F
Synchysite-(Y)16a.1.3.2CaY(CO3)2F
Malachite16a.3.1.1Cu2(CO3)(OH)2
Group 38 - ANHYDROUS NORMAL PHOSPHATES, ARSENATES, AND VANADATES
AXO4
Monazite-(Ce)38.4.3.1Ce(PO4)
Group 40 - HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
(AB)5(XO4)2·xH2O
Grayite40.4.7.4(Th,Pb,Ca)(PO4) · H2O
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with cations in >[6] coordination
Thorite ?51.5.2.3Th(SiO4)
Zircon51.5.2.1Zr(SiO4)
Group 52 - NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
Insular SiO4 Groups and O, OH, F, and H2O with cations in [6] coordination only
Topaz52.3.1.1Al2(SiO4)(F,OH)2
Insular SiO4 Groups and O, OH, F, and H2O with cations in [6] and/or >[6] coordination
Britholite-(Y)52.4.9.2(Y,Ca)5(SiO4)3OH
Group 58 - SOROSILICATES Insular, Mixed, Single, and Larger Tetrahedral Groups
Insular, Mixed, Single, and Larger Tetrahedral Groups with cations in [6] and higher coordination; single and double groups (n = 1, 2)
Allanite-(Ce)58.2.1a.1{CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Muscovite71.2.2a.1KAl2(AlSi3O10)(OH)2
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Group 76 - TECTOSILICATES Al-Si Framework
Al-Si Framework with Al-Si frameworks
Microcline76.1.1.5K(AlSi3O8)
Unclassified Minerals, Rocks, etc.
'Betafite Group'-A2(Ti,Nb)2O6Z
'Pegmatite'-
'Pyrochlore'-
Xenotime-(Y)-Y(PO4)

List of minerals for each chemical element

HHydrogen
H Allanite-(Ce){CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
H Britholite-(Y)(Y,Ca)5(SiO4)3OH
H Grayite(Th,Pb,Ca)(PO4) · H2O
H MalachiteCu2(CO3)(OH)2
H MuscoviteKAl2(AlSi3O10)(OH)2
H Tanteuxenite-(Y)Y(Ta,Nb,Ti)2(O,OH)6
H TopazAl2(SiO4)(F,OH)2
CCarbon
C CalciteCaCO3
C MalachiteCu2(CO3)(OH)2
C Synchysite-(Ce)CaCe(CO3)2F
C Synchysite-(Y)CaY(CO3)2F
OOxygen
O Allanite-(Ce){CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
O Betafite GroupA2(Ti,Nb)2O6Z
O Britholite-(Y)(Y,Ca)5(SiO4)3OH
O CalciteCaCO3
O Columbite-(Fe)FeNb2O6
O Grayite(Th,Pb,Ca)(PO4) · H2O
O MalachiteCu2(CO3)(OH)2
O MicroclineK(AlSi3O8)
O Monazite-(Ce)Ce(PO4)
O MuscoviteKAl2(AlSi3O10)(OH)2
O QuartzSiO2
O Synchysite-(Ce)CaCe(CO3)2F
O Synchysite-(Y)CaY(CO3)2F
O Tanteuxenite-(Y)Y(Ta,Nb,Ti)2(O,OH)6
O ThoriteTh(SiO4)
O TopazAl2(SiO4)(F,OH)2
O Xenotime-(Y)Y(PO4)
O ZirconZr(SiO4)
FFluorine
F FluoriteCaF2
F Synchysite-(Ce)CaCe(CO3)2F
F Synchysite-(Y)CaY(CO3)2F
F TopazAl2(SiO4)(F,OH)2
AlAluminium
Al Allanite-(Ce){CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
Al MicroclineK(AlSi3O8)
Al MuscoviteKAl2(AlSi3O10)(OH)2
Al TopazAl2(SiO4)(F,OH)2
SiSilicon
Si Allanite-(Ce){CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
Si Britholite-(Y)(Y,Ca)5(SiO4)3OH
Si MicroclineK(AlSi3O8)
Si MuscoviteKAl2(AlSi3O10)(OH)2
Si QuartzSiO2
Si ThoriteTh(SiO4)
Si TopazAl2(SiO4)(F,OH)2
Si ZirconZr(SiO4)
PPhosphorus
P Grayite(Th,Pb,Ca)(PO4) · H2O
P Monazite-(Ce)Ce(PO4)
P Xenotime-(Y)Y(PO4)
SSulfur
S ChalcopyriteCuFeS2
S PyriteFeS2
KPotassium
K MicroclineK(AlSi3O8)
K MuscoviteKAl2(AlSi3O10)(OH)2
CaCalcium
Ca Allanite-(Ce){CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
Ca Britholite-(Y)(Y,Ca)5(SiO4)3OH
Ca CalciteCaCO3
Ca FluoriteCaF2
Ca Grayite(Th,Pb,Ca)(PO4) · H2O
Ca Synchysite-(Ce)CaCe(CO3)2F
Ca Synchysite-(Y)CaY(CO3)2F
TiTitanium
Ti Betafite GroupA2(Ti,Nb)2O6Z
Ti Tanteuxenite-(Y)Y(Ta,Nb,Ti)2(O,OH)6
FeIron
Fe Allanite-(Ce){CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
Fe ChalcopyriteCuFeS2
Fe Columbite-(Fe)FeNb2O6
Fe PyriteFeS2
CuCopper
Cu ChalcopyriteCuFeS2
Cu MalachiteCu2(CO3)(OH)2
YYttrium
Y Britholite-(Y)(Y,Ca)5(SiO4)3OH
Y Synchysite-(Y)CaY(CO3)2F
Y Tanteuxenite-(Y)Y(Ta,Nb,Ti)2(O,OH)6
Y Xenotime-(Y)Y(PO4)
ZrZirconium
Zr ZirconZr(SiO4)
NbNiobium
Nb Betafite GroupA2(Ti,Nb)2O6Z
Nb Columbite-(Fe)FeNb2O6
Nb Tanteuxenite-(Y)Y(Ta,Nb,Ti)2(O,OH)6
CeCerium
Ce Allanite-(Ce){CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
Ce Monazite-(Ce)Ce(PO4)
Ce Synchysite-(Ce)CaCe(CO3)2F
TaTantalum
Ta Microlite GroupA2-mTa2X6-wZ-n
Ta Tanteuxenite-(Y)Y(Ta,Nb,Ti)2(O,OH)6
PbLead
Pb Grayite(Th,Pb,Ca)(PO4) · H2O
ThThorium
Th Grayite(Th,Pb,Ca)(PO4) · H2O
Th ThoriteTh(SiO4)

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Neoarchean - Paleoarchean
2500 - 3600 Ma



ID: 2749627
Migmatitic gneiss and amphibolite (Late to Early Archean)

Age: Archean (2500 - 3600 Ma)

Description: Varied gneisses of mostly unknown age in cores of gneiss domes and fault-bounded uplifts (Archean gneiss terranes). Except for the Watersmeet dome (Late to Early Archean), all dated rocks are Late Archean. Includes granite of Late Archean age that transgresses gneisses and amphibolite.

Comments: continental margin assemblage (north of Niagara Fault) Original map source: Cannon, W.F., Kress, T.H., Sutphin, D.M., Morey, G.B., Meints, Joyce, and Barber-Delach, Robert, 1997, Digital Geologic Map and mineral deposits of the Lake Superior Region, Minnesota, Wisconsin, Michigan: USGS Open-File Report 97-455 (version 3, Nov. 19

Lithology: Major:{gneiss,amphibolite,migmatite}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Paleoarchean
3200 - 3600 Ma



ID: 3188340
Archean crystalline metamorphic rocks

Age: Paleoarchean (3200 - 3600 Ma)

Comments: Superior Province

Lithology: Orthogneiss/paragneiss

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License

External Links

Demark, Ramon S. (2000), Mines and Minerals of Michigan's Iron Country, Rocks & Minerals: (March).

Buchholz, T.W., Falster, A.U. and Simmons, W.B. (2013). Accessory mineralogy of the Black River pegmatite and Humboldt granite, Marquette County, Michigan. The 40th Rochester Mineralogical Symposium, Contributed Papers in Specimen Mineralogy, 9-10.


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