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Clark Mine, Copper Harbor, Grant Township, Keweenaw County, Michigan, USA i
Regional Level Types
Clark Mine Mine
Copper Harbor Unincorporated Community
Grant Township Township
Keweenaw County County
Michigan State
USA Country

Regional Level Types
Clark Mine	Mine
Copper Harbor	Unincorporated Community
Grant Township	Township
Keweenaw County	County
Michigan	State
USA	Country

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clark mine u.p .mighagan

Clark Mine, Copper Harbor, Grant Township, Keweenaw County, Michigan, USA

Clark Mine stack

Clark Mine, Copper Harbor, Grant Township, Keweenaw County, Michigan, USA

Tailings pile to the Clark Mine

Clark Mine, Copper Harbor, Grant Township, Keweenaw County, Michigan, USA

clark mine u.p .mighagan

Clark Mine, Copper Harbor, Grant Township, Keweenaw County, Michigan, USA

Clark Mine stack

Clark Mine, Copper Harbor, Grant Township, Keweenaw County, Michigan, USA

Tailings pile to the Clark Mine

Clark Mine, Copper Harbor, Grant Township, Keweenaw County, Michigan, USA

clark mine u.p .mighagan

Clark Mine, Copper Harbor, Grant Township, Keweenaw County, Michigan, USA

Clark Mine stack

Clark Mine, Copper Harbor, Grant Township, Keweenaw County, Michigan, USA

Latitude & Longitude (WGS84):

47° 26' 44'' North , 87° 51' 37'' West

Latitude & Longitude (decimal):

Type:

Köppen climate type:

Dfb : Warm-summer humid continental climate

Nearest Settlements:

Place	Population	Distance
Copper Harbor	108 (2017)	3.3km

Mindat Locality ID:

10119

Long-form identifier:

mindat:1:2:10119:9

GUID (UUID V4):

Introduction
An underground copper mine consisting of eight shafts and three adits located southeast of Copper Harbour.

History
The Clark Mining Company was organized in 1853 and worked a small vein of copper. Work was suspended in 1854 and in 1855, the Societe Francoise des Mines des Cuivres Natif du Lac Superior purchased the property. In 1857, the property was again sold to the French Copper Mining Co. and was combined with the Bell Mining Co. Work was sporadic or done under tribute until 1901, when all work ceased. In 1942, the property was deeded to the Calumet & Hecla Consolidated Mining Co.

For the collector
The mine piles at Clark yield very fine specimens of datolite, prehnite, cuprite, and analcime. The East Vein, about 1 mile north of Clark Mine proper, has also been a favorite for datolite and prehnite.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.

ⓘ Copper

Mineral List

26 valid minerals.

Rock Types Recorded

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

Select Rock List Type

Alphabetical List Tree Diagram

ⓘ 'Pegmatite'

Detailed Mineral List:

ⓘ Analcime

Formula: Na(AlSi₂O₆) · H₂O

References:

Bornhorst, Theodore J., Rose, William I. (1994) Self-guided geological field trip to the Keweenaw Peninsula, Michigan. Proceedings, 40 (2). Institute on Lake Superior Geology. 1-185

ⓘ 'Apophyllite Group'

Formula: AB₄[Si₈O₂₂]X · 8H₂O

References:

Morris, Tom (1983) Michigan Mineralogy. A locality Index. Rocks & Minerals, 58 (3). 107-113 doi:10.1080/00357529.1983.11767128p.111

Rosemeyer, Tom (2009) Copper-bearing Fissure Veins, Keweenaw County, Michigan, Lake Superior Native Copper District (Part 1) Rocks & Minerals, 84 (4) 298-306 doi:10.3200/rmin.84.4.298-306part1

ⓘ Babingtonite

Formula: Ca₂Fe²⁺Fe³⁺Si₅O₁₄(OH)

References:

Larry Maltby, verified by Dr. Robinson and Dr. Jaszczak, Raman Spectroscopy

ⓘ Brochantite

Formula: Cu₄(SO₄)(OH)₆

References:

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

Rosemeyer, Tom (2009) Copper-bearing Fissure Veins, Keweenaw County, Michigan, Lake Superior Native Copper District (Part 1) Rocks & Minerals, 84 (4) 298-306 doi:10.3200/rmin.84.4.298-306part1

ⓘ Calcite

Formula: CaCO₃

References:

Bornhorst, Theodore J., Rose, William I. (1994) Self-guided geological field trip to the Keweenaw Peninsula, Michigan. Proceedings, 40 (2). Institute on Lake Superior Geology. 1-185

Rosemeyer, Tom (2011) News from the Keweenaw: Part 4—Recent Mineral Finds in Michigan's Copper Country (Seventeenth in a series of articles on the mines and minerals of Michigan's Copper Country) Rocks & Minerals, 86 (3) 206-227 doi:10.1080/00357529.2011.568281

✪ Chalcocite

Formula: Cu₂S

Habit: Crystals to 2cm

References:

Morris, Tom (1983) Michigan Mineralogy. A locality Index. Rocks & Minerals, 58 (3). 107-113 doi:10.1080/00357529.1983.11767128p.111

Rosemeyer, Tom (2009) Copper-bearing Fissure Veins, Keweenaw County, Michigan, Lake Superior Native Copper District (Part 1) Rocks & Minerals, 84 (4) 298-306 doi:10.3200/rmin.84.4.298-306part1

ⓘ 'Chlorite Group'

References:

Morris, Tom (1983) Michigan Mineralogy. A locality Index. Rocks & Minerals, 58 (3). 107-113 doi:10.1080/00357529.1983.11767128p.111

ⓘ Clinochlore

Formula: Mg₅Al(AlSi₃O₁₀)(OH)₈

References:

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

ⓘ Cuprite

Formula: Cu₂O

References:

Morris, Tom (1983) Michigan Mineralogy. A locality Index. Rocks & Minerals, 58 (3). 107-113 doi:10.1080/00357529.1983.11767128p.111

Rosemeyer, Tom (2009) Copper-bearing Fissure Veins, Keweenaw County, Michigan, Lake Superior Native Copper District (Part 1) Rocks & Minerals, 84 (4) 298-306 doi:10.3200/rmin.84.4.298-306part1

ⓘ Datolite

Formula: CaB(SiO₄)(OH)

References:

Morris, Tom (1983) Michigan Mineralogy. A locality Index. Rocks & Minerals, 58 (3). 107-113 doi:10.1080/00357529.1983.11767128p.111

Rosemeyer, Tom (2009) Copper-bearing Fissure Veins, Keweenaw County, Michigan, Lake Superior Native Copper District (Part 1) Rocks & Minerals, 84 (4) 298-306 doi:10.3200/rmin.84.4.298-306part1

ⓘ Dolomite

Formula: CaMg(CO₃)₂

References:

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

ⓘ Epidote

Formula: (CaCa)(AlAlFe³⁺)O[Si₂O₇][SiO₄](OH)

References:

Morris, Tom (1983) Michigan Mineralogy. A locality Index. Rocks & Minerals, 58 (3). 107-113 doi:10.1080/00357529.1983.11767128p.111

ⓘ Fluorapophyllite-(K)

Formula: KCa₄(Si₈O₂₀)(F,OH) · 8H₂O

References:

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

ⓘ 'K Feldspar'

References:

Bornhorst, Theodore J., Rose, William I. (1994) Self-guided geological field trip to the Keweenaw Peninsula, Michigan. Proceedings, 40 (2). Institute on Lake Superior Geology. 1-185

ⓘ 'K Feldspar var. Adularia'

Formula: KAlSi₃O₈

References:

Bornhorst, Theodore J., Rose, William I. (1994) Self-guided geological field trip to the Keweenaw Peninsula, Michigan. Proceedings, 40 (2). Institute on Lake Superior Geology. 1-185

ⓘ Langite

Formula: Cu₄(SO₄)(OH)₆ · 2H₂O

References:

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

Rosemeyer, Tom (2009) Copper-bearing Fissure Veins, Keweenaw County, Michigan, Lake Superior Native Copper District (Part 1) Rocks & Minerals, 84 (4) 298-306 doi:10.3200/rmin.84.4.298-306part1

ⓘ Laumontite

Formula: CaAl₂Si₄O₁₂ · 4H₂O

References:

Morris, Tom (1983) Michigan Mineralogy. A locality Index. Rocks & Minerals, 58 (3). 107-113 doi:10.1080/00357529.1983.11767128p.111

ⓘ Malachite

Formula: Cu₂(CO₃)(OH)₂

References:

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

Rosemeyer, Tom (2009) Copper-bearing Fissure Veins, Keweenaw County, Michigan, Lake Superior Native Copper District (Part 1) Rocks & Minerals, 84 (4) 298-306 doi:10.3200/rmin.84.4.298-306part1

ⓘ Microcline

Formula: K(AlSi₃O₈)

References:

Bornhorst, Theodore J., Rose, William I. (1994) Self-guided geological field trip to the Keweenaw Peninsula, Michigan. Proceedings, 40 (2). Institute on Lake Superior Geology. 1-185

ⓘ Native Copper

Formula: Cu

References:

Rocks & Min.: 21:664

58:182.

Rosemeyer, Tom (2009) Copper-bearing Fissure Veins, Keweenaw County, Michigan, Lake Superior Native Copper District (Part 1) Rocks & Minerals, 84 (4) 298-306 doi:10.3200/rmin.84.4.298-306part1

ⓘ Native Silver

Formula: Ag

References:

Rosemeyer, Tom (2009) Copper-bearing Fissure Veins, Keweenaw County, Michigan, Lake Superior Native Copper District (Part 1) Rocks & Minerals, 84 (4) 298-306 doi:10.3200/rmin.84.4.298-306part1

ⓘ Natrolite

Formula: Na₂Al₂Si₃O₁₀ · 2H₂O

References:

Morris, Tom (1983) Michigan Mineralogy. A locality Index. Rocks & Minerals, 58 (3). 107-113 doi:10.1080/00357529.1983.11767128p.111

ⓘ Posnjakite

Formula: Cu₄(SO₄)(OH)₆ · H₂O

References:

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

Rosemeyer, Tom (2009) Copper-bearing Fissure Veins, Keweenaw County, Michigan, Lake Superior Native Copper District (Part 1) Rocks & Minerals, 84 (4) 298-306 doi:10.3200/rmin.84.4.298-306part1

ⓘ Prehnite

Formula: Ca₂Al₂Si₃O₁₀(OH)₂

References:

Rocks & Min.:58:182.

Rosemeyer, Tom (2009) Copper-bearing Fissure Veins, Keweenaw County, Michigan, Lake Superior Native Copper District (Part 1) Rocks & Minerals, 84 (4) 298-306 doi:10.3200/rmin.84.4.298-306part1

ⓘ Pumpellyite-(Fe2+)

Formula: Ca₂Fe²⁺Al₂[Si₂O₆OH][SiO₄](OH)₂(OH)

References:

Bernard, Jan, Hyršl, Jaroslav (2004) Minerals and their Localities (1st ed.) Granit, Prague.

ⓘ 'Pumpellyite Subgroup'

Formula: Ca₂XAl₂[Si₂O₆(OH)][SiO₄](OH)₂A

References:

Morris, Tom (1983) Michigan Mineralogy. A locality Index. Rocks & Minerals, 58 (3). 107-113 doi:10.1080/00357529.1983.11767128p.111

ⓘ Pyrolusite

Formula: Mn⁴⁺O₂

References:

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

ⓘ Quartz

Formula: SiO₂

References:

Rocks & Min.: 21:664

58:111.

Rosemeyer, Tom (2009) Copper-bearing Fissure Veins, Keweenaw County, Michigan, Lake Superior Native Copper District (Part 1) Rocks & Minerals, 84 (4) 298-306 doi:10.3200/rmin.84.4.298-306part1

ⓘ Quartz var. Agate

Formula: SiO₂

References:

Bornhorst, Theodore J., Rose, William I. (1994) Self-guided geological field trip to the Keweenaw Peninsula, Michigan. Proceedings, 40 (2). Institute on Lake Superior Geology. 1-185

ⓘ Quartz var. Chalcedony

Formula: SiO₂

References:

Bornhorst, Theodore J., Rose, William I. (1994) Self-guided geological field trip to the Keweenaw Peninsula, Michigan. Proceedings, 40 (2). Institute on Lake Superior Geology. 1-185

ⓘ Tenorite

Formula: CuO

References:

Bornhorst, Theodore J., Rose, William I. (1994) Self-guided geological field trip to the Keweenaw Peninsula, Michigan. Proceedings, 40 (2). Institute on Lake Superior Geology. 1-185

ⓘ Thomsonite-Ca

Formula: NaCa₂[Al₅Si₅O₂₀] · 6H₂O

References:

Morris, Tom (1983) Michigan Mineralogy. A locality Index. Rocks & Minerals, 58 (3). 107-113 doi:10.1080/00357529.1983.11767128p.111

ⓘ Zircon

Formula: Zr(SiO₄)

References:

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

Gallery:

Ca₂Fe²⁺Fe³⁺Si₅O₁₄(OH)ⓘ Babingtonite

Babingtonite

Clark Mine, Copper Harbor, Grant Township, Keweenaw County, Michigan, USA

Babingtonite

Clark Mine, Copper Harbor, Grant Township, Keweenaw County, Michigan, USA

Babingtonite

Clark Mine, Copper Harbor, Grant Township, Keweenaw County, Michigan, USA

Mg₅Al(AlSi₃O₁₀)(OH)₈ⓘ Clinochlore

Clinochlore

Clark Mine, Copper Harbor, Grant Township, Keweenaw County, Michigan, USA

Clinochlore

Clark Mine, Copper Harbor, Grant Township, Keweenaw County, Michigan, USA

Clinochlore

Clark Mine, Copper Harbor, Grant Township, Keweenaw County, Michigan, USA

Cu₂Oⓘ Cuprite

Cuprite, etc.

Clark Mine, Copper Harbor, Grant Township, Keweenaw County, Michigan, USA

Cuprite, etc.

Clark Mine, Copper Harbor, Grant Township, Keweenaw County, Michigan, USA

Cuprite, etc.

Clark Mine, Copper Harbor, Grant Township, Keweenaw County, Michigan, USA

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
ⓘ	Native Copper	1.AA.05	Cu
ⓘ	Native Silver	1.AA.05	Ag
Group 2 - Sulphides and Sulfosalts
ⓘ	Chalcocite	2.BA.05	Cu₂S
Group 4 - Oxides and Hydroxides
ⓘ	Cuprite	4.AA.10	Cu₂O
ⓘ	Tenorite	4.AB.10	CuO
ⓘ	Quartz var. Agate	4.DA.05	SiO₂
ⓘ	var. Chalcedony	4.DA.05	SiO₂
ⓘ		4.DA.05	SiO₂
ⓘ	Pyrolusite	4.DB.05	Mn⁴⁺O₂
Group 5 - Nitrates and Carbonates
ⓘ	Calcite	5.AB.05	CaCO₃
ⓘ	Dolomite	5.AB.10	CaMg(CO₃)₂
ⓘ	Malachite	5.BA.10	Cu₂(CO₃)(OH)₂
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
ⓘ	Brochantite	7.BB.25	Cu₄(SO₄)(OH)₆
ⓘ	Langite	7.DD.10	Cu₄(SO₄)(OH)₆ · 2H₂O
ⓘ	Posnjakite	7.DD.10	Cu₄(SO₄)(OH)₆ · H₂O
Group 9 - Silicates
ⓘ	Zircon	9.AD.30	Zr(SiO₄)
ⓘ	Datolite	9.AJ.20	CaB(SiO₄)(OH)
ⓘ	Epidote	9.BG.05a	(CaCa)(AlAlFe³⁺)O[Si₂O₇][SiO₄](OH)
ⓘ	Pumpellyite-(Fe2+)	9.BG.20	Ca₂Fe²⁺Al₂[Si₂O₆OH][SiO₄](OH)₂(OH)
ⓘ	Babingtonite	9.DK.05	Ca₂Fe²⁺Fe³⁺Si₅O₁₄(OH)
ⓘ	Prehnite	9.DP.20	Ca₂Al₂Si₃O₁₀(OH)₂
ⓘ	Fluorapophyllite-(K)	9.EA.15	KCa₄(Si₈O₂₀)(F,OH) · 8H₂O
ⓘ	Clinochlore	9.EC.55	Mg₅Al(AlSi₃O₁₀)(OH)₈
ⓘ	Microcline	9.FA.30	K(AlSi₃O₈)
ⓘ	Natrolite	9.GA.05	Na₂Al₂Si₃O₁₀ · 2H₂O
ⓘ	Thomsonite-Ca	9.GA.10	NaCa₂[Al₅Si₅O₂₀] · 6H₂O
ⓘ	Analcime	9.GB.05	Na(AlSi₂O₆) · H₂O
ⓘ	Laumontite	9.GB.10	CaAl₂Si₄O₁₂ · 4H₂O
Unclassified
ⓘ	'K Feldspar var. Adularia'	-	KAlSi₃O₈
ⓘ	'Apophyllite Group'	-	AB₄[Si₈O₂₂]X · 8H₂O
ⓘ	'Chlorite Group'	-
ⓘ	'Pumpellyite Subgroup'	-	Ca₂XAl₂[Si₂O₆(OH)][SiO₄](OH)₂A
ⓘ	'K Feldspar'	-

List of minerals for each chemical element

H	Hydrogen
H	ⓘ Analcime	Na(AlSi₂O₆) · H₂O
H	ⓘ Apophyllite Group	AB₄[Si₈O₂₂]X · 8H₂O
H	ⓘ Babingtonite	Ca₂Fe²⁺Fe³⁺Si₅O₁₄(OH)
H	ⓘ Brochantite	Cu₄(SO₄)(OH)₆
H	ⓘ Clinochlore	Mg₅Al(AlSi₃O₁₀)(OH)₈
H	ⓘ Datolite	CaB(SiO₄)(OH)
H	ⓘ Epidote	(CaCa)(AlAlFe³⁺)O[Si₂O₇][SiO₄](OH)
H	ⓘ Fluorapophyllite-(K)	KCa₄(Si₈O₂₀)(F,OH) · 8H₂O
H	ⓘ Langite	Cu₄(SO₄)(OH)₆ · 2H₂O
H	ⓘ Laumontite	CaAl₂Si₄O₁₂ · 4H₂O
H	ⓘ Malachite	Cu₂(CO₃)(OH)₂
H	ⓘ Natrolite	Na₂Al₂Si₃O₁₀ · 2H₂O
H	ⓘ Posnjakite	Cu₄(SO₄)(OH)₆ · H₂O
H	ⓘ Prehnite	Ca₂Al₂Si₃O₁₀(OH)₂
H	ⓘ Pumpellyite Subgroup	Ca₂XAl₂[Si₂O₆(OH)][SiO₄](OH)₂A
H	ⓘ Pumpellyite-(Fe2+)	Ca₂Fe²⁺Al₂[Si₂O₆OH][SiO₄](OH)₂(OH)
H	ⓘ Thomsonite-Ca	NaCa₂[Al₅Si₅O₂₀] · 6H₂O
B	Boron
B	ⓘ Datolite	CaB(SiO₄)(OH)
C	Carbon
C	ⓘ Calcite	CaCO₃
C	ⓘ Dolomite	CaMg(CO₃)₂
C	ⓘ Malachite	Cu₂(CO₃)(OH)₂
O	Oxygen
O	ⓘ K Feldspar var. Adularia	KAlSi₃O₈
O	ⓘ Quartz var. Agate	SiO₂
O	ⓘ Analcime	Na(AlSi₂O₆) · H₂O
O	ⓘ Apophyllite Group	AB₄[Si₈O₂₂]X · 8H₂O
O	ⓘ Babingtonite	Ca₂Fe²⁺Fe³⁺Si₅O₁₄(OH)
O	ⓘ Brochantite	Cu₄(SO₄)(OH)₆
O	ⓘ Calcite	CaCO₃
O	ⓘ Quartz var. Chalcedony	SiO₂
O	ⓘ Clinochlore	Mg₅Al(AlSi₃O₁₀)(OH)₈
O	ⓘ Cuprite	Cu₂O
O	ⓘ Dolomite	CaMg(CO₃)₂
O	ⓘ Datolite	CaB(SiO₄)(OH)
O	ⓘ Epidote	(CaCa)(AlAlFe³⁺)O[Si₂O₇][SiO₄](OH)
O	ⓘ Fluorapophyllite-(K)	KCa₄(Si₈O₂₀)(F,OH) · 8H₂O
O	ⓘ Langite	Cu₄(SO₄)(OH)₆ · 2H₂O
O	ⓘ Laumontite	CaAl₂Si₄O₁₂ · 4H₂O
O	ⓘ Malachite	Cu₂(CO₃)(OH)₂
O	ⓘ Microcline	K(AlSi₃O₈)
O	ⓘ Natrolite	Na₂Al₂Si₃O₁₀ · 2H₂O
O	ⓘ Posnjakite	Cu₄(SO₄)(OH)₆ · H₂O
O	ⓘ Prehnite	Ca₂Al₂Si₃O₁₀(OH)₂
O	ⓘ Pumpellyite Subgroup	Ca₂XAl₂[Si₂O₆(OH)][SiO₄](OH)₂A
O	ⓘ Pumpellyite-(Fe2+)	Ca₂Fe²⁺Al₂[Si₂O₆OH][SiO₄](OH)₂(OH)
O	ⓘ Pyrolusite	Mn⁴⁺O₂
O	ⓘ Quartz	SiO₂
O	ⓘ Tenorite	CuO
O	ⓘ Thomsonite-Ca	NaCa₂[Al₅Si₅O₂₀] · 6H₂O
O	ⓘ Zircon	Zr(SiO₄)
F	Fluorine
F	ⓘ Fluorapophyllite-(K)	KCa₄(Si₈O₂₀)(F,OH) · 8H₂O
Na	Sodium
Na	ⓘ Analcime	Na(AlSi₂O₆) · H₂O
Na	ⓘ Natrolite	Na₂Al₂Si₃O₁₀ · 2H₂O
Na	ⓘ Thomsonite-Ca	NaCa₂[Al₅Si₅O₂₀] · 6H₂O
Mg	Magnesium
Mg	ⓘ Clinochlore	Mg₅Al(AlSi₃O₁₀)(OH)₈
Mg	ⓘ Dolomite	CaMg(CO₃)₂
Al	Aluminium
Al	ⓘ K Feldspar var. Adularia	KAlSi₃O₈
Al	ⓘ Analcime	Na(AlSi₂O₆) · H₂O
Al	ⓘ Clinochlore	Mg₅Al(AlSi₃O₁₀)(OH)₈
Al	ⓘ Epidote	(CaCa)(AlAlFe³⁺)O[Si₂O₇][SiO₄](OH)
Al	ⓘ Laumontite	CaAl₂Si₄O₁₂ · 4H₂O
Al	ⓘ Microcline	K(AlSi₃O₈)
Al	ⓘ Natrolite	Na₂Al₂Si₃O₁₀ · 2H₂O
Al	ⓘ Prehnite	Ca₂Al₂Si₃O₁₀(OH)₂
Al	ⓘ Pumpellyite Subgroup	Ca₂XAl₂[Si₂O₆(OH)][SiO₄](OH)₂A
Al	ⓘ Pumpellyite-(Fe2+)	Ca₂Fe²⁺Al₂[Si₂O₆OH][SiO₄](OH)₂(OH)
Al	ⓘ Thomsonite-Ca	NaCa₂[Al₅Si₅O₂₀] · 6H₂O
Si	Silicon
Si	ⓘ K Feldspar var. Adularia	KAlSi₃O₈
Si	ⓘ Quartz var. Agate	SiO₂
Si	ⓘ Analcime	Na(AlSi₂O₆) · H₂O
Si	ⓘ Apophyllite Group	AB₄[Si₈O₂₂]X · 8H₂O
Si	ⓘ Babingtonite	Ca₂Fe²⁺Fe³⁺Si₅O₁₄(OH)
Si	ⓘ Quartz var. Chalcedony	SiO₂
Si	ⓘ Clinochlore	Mg₅Al(AlSi₃O₁₀)(OH)₈
Si	ⓘ Datolite	CaB(SiO₄)(OH)
Si	ⓘ Epidote	(CaCa)(AlAlFe³⁺)O[Si₂O₇][SiO₄](OH)
Si	ⓘ Fluorapophyllite-(K)	KCa₄(Si₈O₂₀)(F,OH) · 8H₂O
Si	ⓘ Laumontite	CaAl₂Si₄O₁₂ · 4H₂O
Si	ⓘ Microcline	K(AlSi₃O₈)
Si	ⓘ Natrolite	Na₂Al₂Si₃O₁₀ · 2H₂O
Si	ⓘ Prehnite	Ca₂Al₂Si₃O₁₀(OH)₂
Si	ⓘ Pumpellyite Subgroup	Ca₂XAl₂[Si₂O₆(OH)][SiO₄](OH)₂A
Si	ⓘ Pumpellyite-(Fe2+)	Ca₂Fe²⁺Al₂[Si₂O₆OH][SiO₄](OH)₂(OH)
Si	ⓘ Quartz	SiO₂
Si	ⓘ Thomsonite-Ca	NaCa₂[Al₅Si₅O₂₀] · 6H₂O
Si	ⓘ Zircon	Zr(SiO₄)
S	Sulfur
S	ⓘ Brochantite	Cu₄(SO₄)(OH)₆
S	ⓘ Chalcocite	Cu₂S
S	ⓘ Langite	Cu₄(SO₄)(OH)₆ · 2H₂O
S	ⓘ Posnjakite	Cu₄(SO₄)(OH)₆ · H₂O
K	Potassium
K	ⓘ K Feldspar var. Adularia	KAlSi₃O₈
K	ⓘ Fluorapophyllite-(K)	KCa₄(Si₈O₂₀)(F,OH) · 8H₂O
K	ⓘ Microcline	K(AlSi₃O₈)
Ca	Calcium
Ca	ⓘ Babingtonite	Ca₂Fe²⁺Fe³⁺Si₅O₁₄(OH)
Ca	ⓘ Calcite	CaCO₃
Ca	ⓘ Dolomite	CaMg(CO₃)₂
Ca	ⓘ Datolite	CaB(SiO₄)(OH)
Ca	ⓘ Epidote	(CaCa)(AlAlFe³⁺)O[Si₂O₇][SiO₄](OH)
Ca	ⓘ Fluorapophyllite-(K)	KCa₄(Si₈O₂₀)(F,OH) · 8H₂O
Ca	ⓘ Laumontite	CaAl₂Si₄O₁₂ · 4H₂O
Ca	ⓘ Prehnite	Ca₂Al₂Si₃O₁₀(OH)₂
Ca	ⓘ Pumpellyite Subgroup	Ca₂XAl₂[Si₂O₆(OH)][SiO₄](OH)₂A
Ca	ⓘ Pumpellyite-(Fe2+)	Ca₂Fe²⁺Al₂[Si₂O₆OH][SiO₄](OH)₂(OH)
Ca	ⓘ Thomsonite-Ca	NaCa₂[Al₅Si₅O₂₀] · 6H₂O
Mn	Manganese
Mn	ⓘ Pyrolusite	Mn⁴⁺O₂
Fe	Iron
Fe	ⓘ Babingtonite	Ca₂Fe²⁺Fe³⁺Si₅O₁₄(OH)
Fe	ⓘ Epidote	(CaCa)(AlAlFe³⁺)O[Si₂O₇][SiO₄](OH)
Fe	ⓘ Pumpellyite-(Fe2+)	Ca₂Fe²⁺Al₂[Si₂O₆OH][SiO₄](OH)₂(OH)
Cu	Copper
Cu	ⓘ Brochantite	Cu₄(SO₄)(OH)₆
Cu	ⓘ Chalcocite	Cu₂S
Cu	ⓘ Cuprite	Cu₂O
Cu	ⓘ Native Copper	Cu
Cu	ⓘ Langite	Cu₄(SO₄)(OH)₆ · 2H₂O
Cu	ⓘ Malachite	Cu₂(CO₃)(OH)₂
Cu	ⓘ Posnjakite	Cu₄(SO₄)(OH)₆ · H₂O
Cu	ⓘ Tenorite	CuO
Zr	Zirconium
Zr	ⓘ Zircon	Zr(SiO₄)
Ag	Silver
Ag	ⓘ Native Silver	Ag

Other Regions, Features and Areas containing this locality

North AmericaContinent

North America PlateTectonic Plate

Mid-continent DomainDomain
Mid-continent RiftNarrow Rift

USA

Michigan
- Keweenaw PeninsulaPeninsula
Midcontinent RiftGeologic Province

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

Butler, B.S., Burbank, W.S. (1929) The Copper Deposits of Michigan. U.S. Geological Survey. Professional Paper 144. 238 pp.

Luoma, W.E. (1946) Mineral Collecting in Northern Michigan. Rocks & Minerals: 21(10): 664.

Clarke, D.H. (1974) Copper Mines of Keweenaw; Clark Mining Company, No. 3, 23 pp.

Rocks & Minerals (1983) 58: 111 & 182.

The Copper Country Rock & Mineral Club (2001) Red Gold and Tarnished Silver, 2nd Ed., 44 pp.

Kaminski-Hamka, T. (2011) The Copper Mines of Keweenaw County, Michigan. Copperlady Press. 150 pages.

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