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Central Mine, Central, Houghton Township, Keweenaw County, Michigan, USA i
Regional Level Types
Central Mine Mine
Central Unincorporated Community
Houghton Township Township
Keweenaw County County
Michigan State
USA Country

Regional Level Types
Central Mine	Mine
Central	Unincorporated Community
Houghton Township	Township
Keweenaw County	County
Michigan	State
USA	Country

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Central Mine original miner's house

Central Mine, Central, Houghton Township, Keweenaw County, Michigan, USA

Central Mine ruins

Central Mine, Central, Houghton Township, Keweenaw County, Michigan, USA

Central Mine waste rock view

Central Mine, Central, Houghton Township, Keweenaw County, Michigan, USA

Central Mine original miner's house

Central Mine, Central, Houghton Township, Keweenaw County, Michigan, USA

Central Mine ruins

Central Mine, Central, Houghton Township, Keweenaw County, Michigan, USA

Central Mine waste rock view

Central Mine, Central, Houghton Township, Keweenaw County, Michigan, USA

Central Mine original miner's house

Central Mine, Central, Houghton Township, Keweenaw County, Michigan, USA

Central Mine ruins

Central Mine, Central, Houghton Township, Keweenaw County, Michigan, USA

Latitude & Longitude (WGS84):

47° 24' 29'' North , 88° 11' 54'' West

Latitude & Longitude (decimal):

Type:

Köppen climate type:

Dfb : Warm-summer humid continental climate

Nearest Settlements:

Place	Population	Distance
Ahmeek	146 (2017)	19.2km
Copper City	187 (2017)	19.8km
Copper Harbor	108 (2017)	24.3km
Calumet	703 (2017)	26.3km
Laurium	1,941 (2017)	26.5km

Nearest Clubs:
Local clubs are the best way to get access to collecting localities

Club	Location	Distance
Copper Country Rock and Mineral Club	Dollar Bay, Michigan	40km

Mindat Locality ID:

3849

Long-form identifier:

mindat:1:2:3849:5

GUID (UUID V4):

The Central Mine is located on a fissure deposit and consists of four shafts and two adits. The Central Mining Company was organized in 1854 and has the distinction of being the first mine to turn a profit in its first year of operation. Work continued until 1898 when all operations ceased. It was sold to the Frontenac Copper Company in 1905 and later absorbed by Calumet & Hecla. In its 44 years of operation, the Central produced 51 million lbs of refined copper and a large amount of silver. This mine is a favorite of collectors for its wide variety of minerals that can be found.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded from this region.

ⓘ Copper

Mineral List

Mineral list contains entries from the region specified including sub-localities

24 valid minerals.

Detailed Mineral List:

ⓘ Albite

Formula: Na(AlSi₃O₈)

Locality: Central No. 2 shaft, Central Mine, Central, Houghton Township, Keweenaw County, Michigan, USA

References:

Rosemeyer, T. (2022). News from the Keweenaw: Part 5—Recent Mineral Finds in Michigan’s Copper Country: Twenty-ninth in a series of articles on the mines and minerals of Michigan’s Copper Country. Rocks & Minerals, 97(4), 354-363.

ⓘ Analcime

Formula: Na(AlSi₂O₆) · H₂O

References:

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

ⓘ Azurite

Formula: Cu₃(CO₃)₂(OH)₂

References:

Frank KarastiIdentified by Frank Karasti: Visual Identification, Wet Chemical

ⓘ Calcite

Formula: CaCO₃

References:

Henwood, William Jory (1871) On the Native Copper of Lake Superior, in Observations of Metalliferous Deposits, and on Subterranean Temperature - Part the First. Transactions of the Royal Geological Society of Cornwall, 8 (1). 385-489

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

ⓘ 'Chabazite' ?

References:

Jocelyn Thornton collection/Rod Martin photo https://www.mindat.org/photo-1421453.htmlIdentification: Visual Identification

ⓘ Cuprite

Formula: Cu₂O

References:

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

ⓘ 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

Wilson, Marc L., II, Stanley J. Dyl (1992) The Michigan Copper Country. The Mineralogical Record, 23 (2) 1-76

ⓘ Epidote

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

Localities:

Central Mine, Central, Houghton Township, Keweenaw County, Michigan, USA
Central No. 2 shaft, Central Mine, Central, Houghton Township, Keweenaw County, Michigan, USA

ⓘ 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.

ⓘ Hematite

Formula: Fe₂O₃

Localities:

Central Mine, Central, Houghton Township, Keweenaw County, Michigan, USA
Central No. 2 shaft, Central Mine, Central, Houghton Township, Keweenaw County, Michigan, USA

ⓘ 'Heulandite Subgroup'

Formula: (Na/Ca/K)_5-6[Al_8-9 Si_27-28 O₇₂] · nH₂O

References:

Jocelyn Thornton collection/Rod Martin photo https://www.mindat.org/photo-1421453.htmlIdentification: Visual Identification

ⓘ Ilmenite

Formula: Fe²⁺TiO₃

References:

Justin Bank Collection

ⓘ 'K Feldspar'

References:

Sorrell, Steve (n.d.) Personal communication.

ⓘ 'K Feldspar var. Adularia'

Formula: KAlSi₃O₈

References:

Sorrell, Steve (n.d.) Personal communication.

ⓘ Laumontite

Formula: CaAl₂Si₄O₁₂ · 4H₂O

References:

ⓘ Malachite

Formula: Cu₂(CO₃)(OH)₂

References:

Frank KarastiIdentified by Frank Karasti: Visual Identification, Wet Chemical

ⓘ Manganite

Formula: Mn³⁺O(OH)

Locality: Central No. 2 shaft, Central Mine, Central, Houghton Township, Keweenaw County, Michigan, USA

References:

ⓘ Muscovite

Formula: KAl₂(AlSi₃O₁₀)(OH)₂

References:

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

ⓘ Muscovite var. Sericite

Formula: KAl₂(AlSi₃O₁₀)(OH)₂

References:

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

ⓘ Native Copper

Formula: Cu

Localities:

Central Mine, Central, Houghton Township, Keweenaw County, Michigan, USA
Central No. 2 shaft, Central Mine, Central, Houghton Township, Keweenaw County, Michigan, USA

ⓘ Native Silver

Formula: Ag

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

ⓘ Natrolite

Formula: Na₂Al₂Si₃O₁₀ · 2H₂O

References:

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

ⓘ Prehnite

Formula: Ca₂Al₂Si₃O₁₀(OH)₂

References:

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

Wilson, Marc L., II, Stanley J. Dyl (1992) The Michigan Copper Country. The Mineralogical Record, 23 (2) 1-76

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-(Mg)

Formula: Ca₂MgAl₂[Si₂O₆OH][SiO₄](OH)₂(OH)

References:

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

ⓘ Pumpellyite-(Mg) var. Chlorastrolite

Formula: Ca₂MgAl₂(Si₂O₇)(SiO₄)(OH)₂ · H₂O

References:

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

ⓘ Pumpellyite-(Mn2+)

Formula: Ca₂Mn²⁺Al₂[Si₂O₆OH][SiO₄](OH)₂(OH)

References:

George Balogh collection

ⓘ 'Pumpellyite Subgroup'

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

Localities:

Central Mine, Central, Houghton Township, Keweenaw County, Michigan, USA
Central No. 2 shaft, Central Mine, Central, Houghton Township, Keweenaw County, Michigan, USA

ⓘ 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.

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

ⓘ Rhodochrosite ?

Formula: MnCO₃

References:

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

ⓘ 'Stilbite Subgroup'

Formula: M_6-7[Al_8-9Si_27-28O₇₂] · nH₂O

References:

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

ⓘ Tenorite

Formula: CuO

References:

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

ⓘ 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

Gallery:

CaCO₃ⓘ Calcite

Calcite, etc.

Central Mine, Central, Houghton Township, Keweenaw County, Michigan, USA

Calcite, etc.

Central Mine, Central, Houghton Township, Keweenaw County, Michigan, USA

Calcite, etc.

Central Mine, Central, Houghton Township, Keweenaw County, Michigan, USA

Calcite, etc.

Central Mine, Central, Houghton Township, Keweenaw County, Michigan, USA

Calcite, etc.

Central Mine, Central, Houghton Township, Keweenaw County, Michigan, USA

Calcite, etc.

Central Mine, Central, Houghton Township, Keweenaw County, Michigan, USA

Calcite, etc.

Central Mine, Central, Houghton Township, Keweenaw County, Michigan, USA

KAlSi₃O₈ⓘ 'K Feldspar var. Adularia'

Adularia

Central Mine, Central, Houghton Township, Keweenaw County, Michigan, USA

Adularia

Central Mine, Central, Houghton Township, Keweenaw County, Michigan, USA

Adularia

Central Mine, Central, Houghton Township, Keweenaw County, Michigan, USA

Cu₂(CO₃)(OH)₂ⓘ Malachite

Malachite, etc.

Central Mine, Central, Houghton Township, Keweenaw County, Michigan, USA

Malachite, etc.

Central Mine, Central, Houghton Township, Keweenaw County, Michigan, USA

Malachite, etc.

Central Mine, Central, Houghton Township, Keweenaw County, Michigan, USA

Cuⓘ Native Copper

Native Copper

Central Mine, Central, Houghton Township, Keweenaw County, Michigan, USA

Native Copper

Central Mine, Central, Houghton Township, Keweenaw County, Michigan, USA

Native Copper, etc.

Central Mine, Central, Houghton Township, Keweenaw County, Michigan, USA

Native Copper

Central Mine, Central, Houghton Township, Keweenaw County, Michigan, USA

Native Copper, etc.

Central Mine, Central, Houghton Township, Keweenaw County, Michigan, USA

Native Copper

Central Mine, Central, Houghton Township, Keweenaw County, Michigan, USA

Native Copper

Central Mine, Central, Houghton Township, Keweenaw County, Michigan, USA

Native Copper

Central Mine, Central, Houghton Township, Keweenaw County, Michigan, USA

Agⓘ Native Silver

Native Silver, etc.

Central Mine, Central, Houghton Township, Keweenaw County, Michigan, USA

Native Silver, etc.

Central Mine, Central, Houghton Township, Keweenaw County, Michigan, USA

Native Silver, etc.

Central Mine, Central, Houghton Township, Keweenaw County, Michigan, USA

Ca₂MgAl₂(Si₂O₇)(SiO₄)(OH)₂ · H₂Oⓘ Pumpellyite-(Mg) var. Chlorastrolite

Chlorastrolite

Central Mine, Central, Houghton Township, Keweenaw County, Michigan, USA

Chlorastrolite

Central Mine, Central, Houghton Township, Keweenaw County, Michigan, USA

Chlorastrolite

Central Mine, Central, Houghton 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 4 - Oxides and Hydroxides
ⓘ	Cuprite	4.AA.10	Cu₂O
ⓘ	Tenorite	4.AB.10	CuO
ⓘ	Hematite	4.CB.05	Fe₂O₃
ⓘ	Ilmenite	4.CB.05	Fe²⁺TiO₃
ⓘ	Quartz	4.DA.05	SiO₂
ⓘ	Manganite	4.FD.15	Mn³⁺O(OH)
Group 5 - Nitrates and Carbonates
ⓘ	Calcite	5.AB.05	CaCO₃
ⓘ	Rhodochrosite ?	5.AB.05	MnCO₃
ⓘ	Azurite	5.BA.05	Cu₃(CO₃)₂(OH)₂
ⓘ	Malachite	5.BA.10	Cu₂(CO₃)(OH)₂
Group 9 - Silicates
ⓘ	Datolite	9.AJ.20	CaB(SiO₄)(OH)
ⓘ	Epidote	9.BG.05a	(CaCa)(AlAlFe³⁺)O[Si₂O₇][SiO₄](OH)
ⓘ	Pumpellyite-(Mg)	9.BG.20	Ca₂MgAl₂[Si₂O₆OH][SiO₄](OH)₂(OH)
ⓘ	Pumpellyite-(Mn2+)	9.BG.20	Ca₂Mn²⁺Al₂[Si₂O₆OH][SiO₄](OH)₂(OH)
ⓘ	Pumpellyite-(Mg) var. Chlorastrolite	9.BG.20	Ca₂MgAl₂(Si₂O₇)(SiO₄)(OH)₂ · H₂O
ⓘ	Prehnite	9.DP.20	Ca₂Al₂Si₃O₁₀(OH)₂
ⓘ	Fluorapophyllite-(K)	9.EA.15	KCa₄(Si₈O₂₀)(F,OH) · 8H₂O
ⓘ	Muscovite	9.EC.15	KAl₂(AlSi₃O₁₀)(OH)₂
ⓘ	var. Sericite	9.EC.15	KAl₂(AlSi₃O₁₀)(OH)₂
ⓘ	Albite	9.FA.35	Na(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
ⓘ	'Chabazite' ?	-
ⓘ	'Heulandite Subgroup'	-	(Na/Ca/K)_5-6[Al_8-9 Si_27-28 O₇₂] · nH₂O
ⓘ	'Pumpellyite Subgroup'	-	Ca₂XAl₂[Si₂O₆(OH)][SiO₄](OH)₂A
ⓘ	'Stilbite Subgroup'	-	M_6-7[Al_8-9Si_27-28O₇₂] · nH₂O
ⓘ	'K Feldspar'	-

List of minerals for each chemical element

H	Hydrogen
H	ⓘ Analcime	Na(AlSi₂O₆) · H₂O
H	ⓘ Azurite	Cu₃(CO₃)₂(OH)₂
H	ⓘ Datolite	CaB(SiO₄)(OH)
H	ⓘ Epidote	(CaCa)(AlAlFe³⁺)O[Si₂O₇][SiO₄](OH)
H	ⓘ Fluorapophyllite-(K)	KCa₄(Si₈O₂₀)(F,OH) · 8H₂O
H	ⓘ Heulandite Subgroup	(Na/Ca/K)_5-6[Al_8-9 Si_27-28 O₇₂] · nH₂O
H	ⓘ Laumontite	CaAl₂Si₄O₁₂ · 4H₂O
H	ⓘ Manganite	Mn³⁺O(OH)
H	ⓘ Malachite	Cu₂(CO₃)(OH)₂
H	ⓘ Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂
H	ⓘ Natrolite	Na₂Al₂Si₃O₁₀ · 2H₂O
H	ⓘ Prehnite	Ca₂Al₂Si₃O₁₀(OH)₂
H	ⓘ Pumpellyite Subgroup	Ca₂XAl₂[Si₂O₆(OH)][SiO₄](OH)₂A
H	ⓘ Pumpellyite-(Mg)	Ca₂MgAl₂[Si₂O₆OH][SiO₄](OH)₂(OH)
H	ⓘ Pumpellyite-(Mn2+)	Ca₂Mn²⁺Al₂[Si₂O₆OH][SiO₄](OH)₂(OH)
H	ⓘ Stilbite Subgroup	M_6-7[Al_8-9Si_27-28O₇₂] · nH₂O
H	ⓘ Thomsonite-Ca	NaCa₂[Al₅Si₅O₂₀] · 6H₂O
H	ⓘ Muscovite var. Sericite	KAl₂(AlSi₃O₁₀)(OH)₂
H	ⓘ Pumpellyite-(Mg) var. Chlorastrolite	Ca₂MgAl₂(Si₂O₇)(SiO₄)(OH)₂ · H₂O
B	Boron
B	ⓘ Datolite	CaB(SiO₄)(OH)
C	Carbon
C	ⓘ Azurite	Cu₃(CO₃)₂(OH)₂
C	ⓘ Calcite	CaCO₃
C	ⓘ Malachite	Cu₂(CO₃)(OH)₂
C	ⓘ Rhodochrosite	MnCO₃
O	Oxygen
O	ⓘ K Feldspar var. Adularia	KAlSi₃O₈
O	ⓘ Albite	Na(AlSi₃O₈)
O	ⓘ Analcime	Na(AlSi₂O₆) · H₂O
O	ⓘ Azurite	Cu₃(CO₃)₂(OH)₂
O	ⓘ Calcite	CaCO₃
O	ⓘ Cuprite	Cu₂O
O	ⓘ Datolite	CaB(SiO₄)(OH)
O	ⓘ Epidote	(CaCa)(AlAlFe³⁺)O[Si₂O₇][SiO₄](OH)
O	ⓘ Fluorapophyllite-(K)	KCa₄(Si₈O₂₀)(F,OH) · 8H₂O
O	ⓘ Hematite	Fe₂O₃
O	ⓘ Heulandite Subgroup	(Na/Ca/K)_5-6[Al_8-9 Si_27-28 O₇₂] · nH₂O
O	ⓘ Ilmenite	Fe²⁺TiO₃
O	ⓘ Laumontite	CaAl₂Si₄O₁₂ · 4H₂O
O	ⓘ Manganite	Mn³⁺O(OH)
O	ⓘ Malachite	Cu₂(CO₃)(OH)₂
O	ⓘ Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂
O	ⓘ Natrolite	Na₂Al₂Si₃O₁₀ · 2H₂O
O	ⓘ Prehnite	Ca₂Al₂Si₃O₁₀(OH)₂
O	ⓘ Pumpellyite Subgroup	Ca₂XAl₂[Si₂O₆(OH)][SiO₄](OH)₂A
O	ⓘ Pumpellyite-(Mg)	Ca₂MgAl₂[Si₂O₆OH][SiO₄](OH)₂(OH)
O	ⓘ Pumpellyite-(Mn2+)	Ca₂Mn²⁺Al₂[Si₂O₆OH][SiO₄](OH)₂(OH)
O	ⓘ Quartz	SiO₂
O	ⓘ Rhodochrosite	MnCO₃
O	ⓘ Stilbite Subgroup	M_6-7[Al_8-9Si_27-28O₇₂] · nH₂O
O	ⓘ Tenorite	CuO
O	ⓘ Thomsonite-Ca	NaCa₂[Al₅Si₅O₂₀] · 6H₂O
O	ⓘ Muscovite var. Sericite	KAl₂(AlSi₃O₁₀)(OH)₂
O	ⓘ Pumpellyite-(Mg) var. Chlorastrolite	Ca₂MgAl₂(Si₂O₇)(SiO₄)(OH)₂ · H₂O
F	Fluorine
F	ⓘ Fluorapophyllite-(K)	KCa₄(Si₈O₂₀)(F,OH) · 8H₂O
Na	Sodium
Na	ⓘ Albite	Na(AlSi₃O₈)
Na	ⓘ Analcime	Na(AlSi₂O₆) · H₂O
Na	ⓘ Heulandite Subgroup	(Na/Ca/K)_5-6[Al_8-9 Si_27-28 O₇₂] · nH₂O
Na	ⓘ Natrolite	Na₂Al₂Si₃O₁₀ · 2H₂O
Na	ⓘ Thomsonite-Ca	NaCa₂[Al₅Si₅O₂₀] · 6H₂O
Mg	Magnesium
Mg	ⓘ Pumpellyite-(Mg)	Ca₂MgAl₂[Si₂O₆OH][SiO₄](OH)₂(OH)
Mg	ⓘ Pumpellyite-(Mg) var. Chlorastrolite	Ca₂MgAl₂(Si₂O₇)(SiO₄)(OH)₂ · H₂O
Al	Aluminium
Al	ⓘ K Feldspar var. Adularia	KAlSi₃O₈
Al	ⓘ Albite	Na(AlSi₃O₈)
Al	ⓘ Analcime	Na(AlSi₂O₆) · H₂O
Al	ⓘ Epidote	(CaCa)(AlAlFe³⁺)O[Si₂O₇][SiO₄](OH)
Al	ⓘ Heulandite Subgroup	(Na/Ca/K)_5-6[Al_8-9 Si_27-28 O₇₂] · nH₂O
Al	ⓘ Laumontite	CaAl₂Si₄O₁₂ · 4H₂O
Al	ⓘ Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂
Al	ⓘ Natrolite	Na₂Al₂Si₃O₁₀ · 2H₂O
Al	ⓘ Prehnite	Ca₂Al₂Si₃O₁₀(OH)₂
Al	ⓘ Pumpellyite Subgroup	Ca₂XAl₂[Si₂O₆(OH)][SiO₄](OH)₂A
Al	ⓘ Pumpellyite-(Mg)	Ca₂MgAl₂[Si₂O₆OH][SiO₄](OH)₂(OH)
Al	ⓘ Pumpellyite-(Mn2+)	Ca₂Mn²⁺Al₂[Si₂O₆OH][SiO₄](OH)₂(OH)
Al	ⓘ Stilbite Subgroup	M_6-7[Al_8-9Si_27-28O₇₂] · nH₂O
Al	ⓘ Thomsonite-Ca	NaCa₂[Al₅Si₅O₂₀] · 6H₂O
Al	ⓘ Muscovite var. Sericite	KAl₂(AlSi₃O₁₀)(OH)₂
Al	ⓘ Pumpellyite-(Mg) var. Chlorastrolite	Ca₂MgAl₂(Si₂O₇)(SiO₄)(OH)₂ · H₂O
Si	Silicon
Si	ⓘ K Feldspar var. Adularia	KAlSi₃O₈
Si	ⓘ Albite	Na(AlSi₃O₈)
Si	ⓘ Analcime	Na(AlSi₂O₆) · H₂O
Si	ⓘ Datolite	CaB(SiO₄)(OH)
Si	ⓘ Epidote	(CaCa)(AlAlFe³⁺)O[Si₂O₇][SiO₄](OH)
Si	ⓘ Fluorapophyllite-(K)	KCa₄(Si₈O₂₀)(F,OH) · 8H₂O
Si	ⓘ Heulandite Subgroup	(Na/Ca/K)_5-6[Al_8-9 Si_27-28 O₇₂] · nH₂O
Si	ⓘ Laumontite	CaAl₂Si₄O₁₂ · 4H₂O
Si	ⓘ Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂
Si	ⓘ Natrolite	Na₂Al₂Si₃O₁₀ · 2H₂O
Si	ⓘ Prehnite	Ca₂Al₂Si₃O₁₀(OH)₂
Si	ⓘ Pumpellyite Subgroup	Ca₂XAl₂[Si₂O₆(OH)][SiO₄](OH)₂A
Si	ⓘ Pumpellyite-(Mg)	Ca₂MgAl₂[Si₂O₆OH][SiO₄](OH)₂(OH)
Si	ⓘ Pumpellyite-(Mn2+)	Ca₂Mn²⁺Al₂[Si₂O₆OH][SiO₄](OH)₂(OH)
Si	ⓘ Quartz	SiO₂
Si	ⓘ Stilbite Subgroup	M_6-7[Al_8-9Si_27-28O₇₂] · nH₂O
Si	ⓘ Thomsonite-Ca	NaCa₂[Al₅Si₅O₂₀] · 6H₂O
Si	ⓘ Muscovite var. Sericite	KAl₂(AlSi₃O₁₀)(OH)₂
Si	ⓘ Pumpellyite-(Mg) var. Chlorastrolite	Ca₂MgAl₂(Si₂O₇)(SiO₄)(OH)₂ · H₂O
K	Potassium
K	ⓘ K Feldspar var. Adularia	KAlSi₃O₈
K	ⓘ Fluorapophyllite-(K)	KCa₄(Si₈O₂₀)(F,OH) · 8H₂O
K	ⓘ Heulandite Subgroup	(Na/Ca/K)_5-6[Al_8-9 Si_27-28 O₇₂] · nH₂O
K	ⓘ Muscovite	KAl₂(AlSi₃O₁₀)(OH)₂
K	ⓘ Muscovite var. Sericite	KAl₂(AlSi₃O₁₀)(OH)₂
Ca	Calcium
Ca	ⓘ Calcite	CaCO₃
Ca	ⓘ Datolite	CaB(SiO₄)(OH)
Ca	ⓘ Epidote	(CaCa)(AlAlFe³⁺)O[Si₂O₇][SiO₄](OH)
Ca	ⓘ Fluorapophyllite-(K)	KCa₄(Si₈O₂₀)(F,OH) · 8H₂O
Ca	ⓘ Heulandite Subgroup	(Na/Ca/K)_5-6[Al_8-9 Si_27-28 O₇₂] · nH₂O
Ca	ⓘ Laumontite	CaAl₂Si₄O₁₂ · 4H₂O
Ca	ⓘ Prehnite	Ca₂Al₂Si₃O₁₀(OH)₂
Ca	ⓘ Pumpellyite Subgroup	Ca₂XAl₂[Si₂O₆(OH)][SiO₄](OH)₂A
Ca	ⓘ Pumpellyite-(Mg)	Ca₂MgAl₂[Si₂O₆OH][SiO₄](OH)₂(OH)
Ca	ⓘ Pumpellyite-(Mn2+)	Ca₂Mn²⁺Al₂[Si₂O₆OH][SiO₄](OH)₂(OH)
Ca	ⓘ Thomsonite-Ca	NaCa₂[Al₅Si₅O₂₀] · 6H₂O
Ca	ⓘ Pumpellyite-(Mg) var. Chlorastrolite	Ca₂MgAl₂(Si₂O₇)(SiO₄)(OH)₂ · H₂O
Ti	Titanium
Ti	ⓘ Ilmenite	Fe²⁺TiO₃
Mn	Manganese
Mn	ⓘ Manganite	Mn³⁺O(OH)
Mn	ⓘ Pumpellyite-(Mn2+)	Ca₂Mn²⁺Al₂[Si₂O₆OH][SiO₄](OH)₂(OH)
Mn	ⓘ Rhodochrosite	MnCO₃
Fe	Iron
Fe	ⓘ Epidote	(CaCa)(AlAlFe³⁺)O[Si₂O₇][SiO₄](OH)
Fe	ⓘ Hematite	Fe₂O₃
Fe	ⓘ Ilmenite	Fe²⁺TiO₃
Cu	Copper
Cu	ⓘ Azurite	Cu₃(CO₃)₂(OH)₂
Cu	ⓘ Cuprite	Cu₂O
Cu	ⓘ Native Copper	Cu
Cu	ⓘ Malachite	Cu₂(CO₃)(OH)₂
Cu	ⓘ Tenorite	CuO
Ag	Silver
Ag	ⓘ Native Silver	Ag

Localities in this Region

USA

Michigan
- Keweenaw County
  - Houghton Township
    - Central
      - Central Mine
        Central No. 2 shaft

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.

The Copper Country Rock & Mineral Club (2001) Red Gold and Tarnished Silver, 2nd edition. Self-Published. 44 pages.

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