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.

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Standard Detailed Gallery Strunz Chemical Elements

Mineral List

20 valid minerals.

Rock Types Recorded

Note: data is currently VERY limited. Please bear with us while we work towards adding this information!

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Alphabetical List Tree Diagram

ⓘ 'Pegmatite'

Detailed Mineral List:

ⓘ Allanite-(Ce)

Formula: (CaCe)(AlAlFe²⁺)O[Si₂O₇][SiO₄](OH)

References:

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

References:

ⓘ Britholite-(Y)

Formula: (Y,Ca)₅(SiO₄)₃OH

Description: Microcrystals within anhedral fluorite

References:

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

ⓘ Calcite

Formula: CaCO₃

References:

ⓘ Chalcopyrite

Formula: CuFeS₂

References:

ⓘ Columbite-(Fe)

Formula: Fe²⁺Nb₂O₆

References:

Columbite-(Fe): analyzed by George Robinson of Michigan Tech 2009

ⓘ Fluorite

Formula: CaF₂

Habit: anhedral masses

Colour: purple, yellow-green

References:

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

ⓘ Grayite

Formula: (Th,Pb,Ca)(PO₄) · H₂O

References:

ⓘ Malachite

Formula: Cu₂(CO₃)(OH)₂

References:

ⓘ Microcline

Formula: K(AlSi₃O₈)

References:

Heinrich, E. W., Robinson, George Willard (2004) Mineralogy of Michigan (2nd ed.) A.E. Seaman Mineral Museum and Michigan Technological University. 252pp.

ⓘ 'Microlite Group'

Formula: A_2-mTa₂X_6-wZ_-n

References:

ⓘ Monazite-(Ce)

Formula: Ce(PO₄)

References:

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

References:

Dave Maietta - Collection

ⓘ Pyrite

Formula: FeS₂

References:

ⓘ 'Pyrochlore Group'

Formula: A₂Nb₂(O,OH)₆Z

References:

ⓘ Quartz

Formula: SiO₂

References:

Heinrich, E. W., Robinson, George Willard (2004) Mineralogy of Michigan (2nd ed.) A.E. Seaman Mineral Museum and Michigan Technological University. 252pp.

ⓘ Synchysite-(Ce) ?

Formula: CaCe(CO₃)₂F

References:

ⓘ Synchysite-(Y)

Formula: CaY(CO₃)₂F

References:

ⓘ Tanteuxenite-(Y)

Formula: Y(Ta,Nb,Ti)₂(O,OH)₆

References:

ⓘ Thorite ?

Formula: Th(SiO₄)

References:

ⓘ Topaz

Formula: Al₂(SiO₄)(F,OH)₂

References:

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

References:

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

ⓘ Zircon

Formula: Zr(SiO₄)

References:

Gallery:

Fe²⁺Nb₂O₆ⓘ Columbite-(Fe)

CaF₂ⓘ Fluorite

K(AlSi₃O₈)ⓘ Microcline

Ce(PO₄)ⓘ Monazite-(Ce)

Al₂(SiO₄)(F,OH)₂ⓘ Topaz

Y(PO₄)ⓘ Xenotime-(Y)

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
ⓘ	Chalcopyrite	2.CB.10a	CuFeS₂
ⓘ	Pyrite	2.EB.05a	FeS₂
Group 3 - Halides
ⓘ	Fluorite	3.AB.25	CaF₂
Group 4 - Oxides and Hydroxides
ⓘ	'Pyrochlore Group'	4.00.	A₂Nb₂(O,OH)₆Z
ⓘ	'Microlite Group'	4.00.	A_2-mTa₂X_6-wZ_-n
ⓘ	Quartz	4.DA.05	SiO₂
ⓘ	Columbite-(Fe)	4.DB.35	Fe²⁺Nb₂O₆
ⓘ	Tanteuxenite-(Y)	4.DG.05	Y(Ta,Nb,Ti)₂(O,OH)₆
Group 5 - Nitrates and Carbonates
ⓘ	Calcite	5.AB.05	CaCO₃
ⓘ	Malachite	5.BA.10	Cu₂(CO₃)(OH)₂
ⓘ	Synchysite-(Y)	5.BD.20c	CaY(CO₃)₂F
ⓘ	Synchysite-(Ce) ?	5.BD.20c	CaCe(CO₃)₂F
Group 8 - Phosphates, Arsenates and Vanadates
ⓘ	Xenotime-(Y)	8.AD.35	Y(PO₄)
ⓘ	Monazite-(Ce)	8.AD.50	Ce(PO₄)
ⓘ	Grayite	8.CJ.45	(Th,Pb,Ca)(PO₄) · H₂O
Group 9 - Silicates
ⓘ	Thorite ?	9.AD.30	Th(SiO₄)
ⓘ	Zircon	9.AD.30	Zr(SiO₄)
ⓘ	Topaz	9.AF.35	Al₂(SiO₄)(F,OH)₂
ⓘ	Britholite-(Y)	9.AH.25	(Y,Ca)₅(SiO₄)₃OH
ⓘ	Allanite-(Ce)	9.BG.05b	(CaCe)(AlAlFe²⁺)O[Si₂O₇][SiO₄](OH)
ⓘ	Muscovite	9.EC.15	KAl₂(AlSi₃O₁₀)(OH)₂
ⓘ	Microcline	9.FA.30	K(AlSi₃O₈)
Unclassified
ⓘ	'Betafite Group'	-	A₂(Ti,Nb)₂O₆Z

List of minerals for each chemical element

H	Hydrogen
H	ⓘ Allanite-(Ce)	(CaCe)(AlAlFe²⁺)O[Si₂O₇][SiO₄](OH)
H	ⓘ Britholite-(Y)	(Y,Ca)₅(SiO₄)₃OH
H	ⓘ Grayite	(Th,Pb,Ca)(PO₄) · H₂O
H	ⓘ Malachite	Cu₂(CO₃)(OH)₂
H	ⓘ Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂
H	ⓘ Pyrochlore Group	A₂Nb₂(O,OH)₆Z
H	ⓘ Tanteuxenite-(Y)	Y(Ta,Nb,Ti)₂(O,OH)₆
H	ⓘ Topaz	Al₂(SiO₄)(F,OH)₂
C	Carbon
C	ⓘ Calcite	CaCO₃
C	ⓘ Malachite	Cu₂(CO₃)(OH)₂
C	ⓘ Synchysite-(Ce)	CaCe(CO₃)₂F
C	ⓘ Synchysite-(Y)	CaY(CO₃)₂F
O	Oxygen
O	ⓘ Allanite-(Ce)	(CaCe)(AlAlFe²⁺)O[Si₂O₇][SiO₄](OH)
O	ⓘ Britholite-(Y)	(Y,Ca)₅(SiO₄)₃OH
O	ⓘ Calcite	CaCO₃
O	ⓘ Columbite-(Fe)	Fe²⁺Nb₂O₆
O	ⓘ Grayite	(Th,Pb,Ca)(PO₄) · H₂O
O	ⓘ Malachite	Cu₂(CO₃)(OH)₂
O	ⓘ Microcline	K(AlSi₃O₈)
O	ⓘ Monazite-(Ce)	Ce(PO₄)
O	ⓘ Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂
O	ⓘ Pyrochlore Group	A₂Nb₂(O,OH)₆Z
O	ⓘ Quartz	SiO₂
O	ⓘ Synchysite-(Ce)	CaCe(CO₃)₂F
O	ⓘ Synchysite-(Y)	CaY(CO₃)₂F
O	ⓘ Tanteuxenite-(Y)	Y(Ta,Nb,Ti)₂(O,OH)₆
O	ⓘ Thorite	Th(SiO₄)
O	ⓘ Topaz	Al₂(SiO₄)(F,OH)₂
O	ⓘ Xenotime-(Y)	Y(PO₄)
O	ⓘ Zircon	Zr(SiO₄)
O	ⓘ Betafite Group	A₂(Ti,Nb)₂O₆Z
F	Fluorine
F	ⓘ Fluorite	CaF₂
F	ⓘ Synchysite-(Ce)	CaCe(CO₃)₂F
F	ⓘ Synchysite-(Y)	CaY(CO₃)₂F
F	ⓘ Topaz	Al₂(SiO₄)(F,OH)₂
Al	Aluminium
Al	ⓘ Allanite-(Ce)	(CaCe)(AlAlFe²⁺)O[Si₂O₇][SiO₄](OH)
Al	ⓘ Microcline	K(AlSi₃O₈)
Al	ⓘ Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂
Al	ⓘ Topaz	Al₂(SiO₄)(F,OH)₂
Si	Silicon
Si	ⓘ Allanite-(Ce)	(CaCe)(AlAlFe²⁺)O[Si₂O₇][SiO₄](OH)
Si	ⓘ Britholite-(Y)	(Y,Ca)₅(SiO₄)₃OH
Si	ⓘ Microcline	K(AlSi₃O₈)
Si	ⓘ Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂
Si	ⓘ Quartz	SiO₂
Si	ⓘ Thorite	Th(SiO₄)
Si	ⓘ Topaz	Al₂(SiO₄)(F,OH)₂
Si	ⓘ Zircon	Zr(SiO₄)
P	Phosphorus
P	ⓘ Grayite	(Th,Pb,Ca)(PO₄) · H₂O
P	ⓘ Monazite-(Ce)	Ce(PO₄)
P	ⓘ Xenotime-(Y)	Y(PO₄)
S	Sulfur
S	ⓘ Chalcopyrite	CuFeS₂
S	ⓘ Pyrite	FeS₂
K	Potassium
K	ⓘ Microcline	K(AlSi₃O₈)
K	ⓘ Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂
Ca	Calcium
Ca	ⓘ Allanite-(Ce)	(CaCe)(AlAlFe²⁺)O[Si₂O₇][SiO₄](OH)
Ca	ⓘ Britholite-(Y)	(Y,Ca)₅(SiO₄)₃OH
Ca	ⓘ Calcite	CaCO₃
Ca	ⓘ Fluorite	CaF₂
Ca	ⓘ Grayite	(Th,Pb,Ca)(PO₄) · H₂O
Ca	ⓘ Synchysite-(Ce)	CaCe(CO₃)₂F
Ca	ⓘ Synchysite-(Y)	CaY(CO₃)₂F
Ti	Titanium
Ti	ⓘ Tanteuxenite-(Y)	Y(Ta,Nb,Ti)₂(O,OH)₆
Ti	ⓘ Betafite Group	A₂(Ti,Nb)₂O₆Z
Fe	Iron
Fe	ⓘ Allanite-(Ce)	(CaCe)(AlAlFe²⁺)O[Si₂O₇][SiO₄](OH)
Fe	ⓘ Chalcopyrite	CuFeS₂
Fe	ⓘ Columbite-(Fe)	Fe²⁺Nb₂O₆
Fe	ⓘ Pyrite	FeS₂
Cu	Copper
Cu	ⓘ Chalcopyrite	CuFeS₂
Cu	ⓘ Malachite	Cu₂(CO₃)(OH)₂
Y	Yttrium
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)
Zr	Zirconium
Zr	ⓘ Zircon	Zr(SiO₄)
Nb	Niobium
Nb	ⓘ Columbite-(Fe)	Fe²⁺Nb₂O₆
Nb	ⓘ Pyrochlore Group	A₂Nb₂(O,OH)₆Z
Nb	ⓘ Tanteuxenite-(Y)	Y(Ta,Nb,Ti)₂(O,OH)₆
Nb	ⓘ Betafite Group	A₂(Ti,Nb)₂O₆Z
Ce	Cerium
Ce	ⓘ Allanite-(Ce)	(CaCe)(AlAlFe²⁺)O[Si₂O₇][SiO₄](OH)
Ce	ⓘ Monazite-(Ce)	Ce(PO₄)
Ce	ⓘ Synchysite-(Ce)	CaCe(CO₃)₂F
Ta	Tantalum
Ta	ⓘ Microlite Group	A_2-mTa₂X_6-wZ_-n
Ta	ⓘ Tanteuxenite-(Y)	Y(Ta,Nb,Ti)₂(O,OH)₆
Pb	Lead
Pb	ⓘ Grayite	(Th,Pb,Ca)(PO₄) · H₂O
Th	Thorium
Th	ⓘ Grayite	(Th,Pb,Ca)(PO₄) · H₂O
Th	ⓘ Thorite	Th(SiO₄)

Other Regions, Features and Areas containing this locality

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Black River pegmatite, Republic, Marquette County, Michigan, USAiRegional Level TypesBlack River pegmatitePegmatite Republic- not defined - Marquette CountyCounty MichiganState USACountry function showexplain() { $("#locexplain").toggle(); if (typeof movemap === "function") movemap(); }

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Mineral List

Rock Types Recorded

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Detailed Mineral List:

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List of minerals arranged by Strunz 10th Edition classification

List of minerals for each chemical element

Other Regions, Features and Areas containing this locality

Black River pegmatite, Republic, Marquette County, Michigan, USA i
Regional Level Types
Black River pegmatite Pegmatite
Republic - not defined -
Marquette County County
Michigan State
USA Country