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Point Prospect, Grant Township, Keweenaw County, Michigan, USAi
Regional Level Types
Point ProspectProspect
Grant TownshipTownship
Keweenaw CountyCounty
MichiganState
USACountry

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00977790017272252039433.jpg
Native Copper

Point Prospect, Grant Township, Keweenaw County, Michigan, USA
06871180017272252039506.jpg
Native Copper

Point Prospect, Grant Township, Keweenaw County, Michigan, USA
00977790017272252039433.jpg
Native Copper

Point Prospect, Grant Township, Keweenaw County, Michigan, USA
06871180017272252039506.jpg
Native Copper

Point Prospect, Grant Township, Keweenaw County, Michigan, USA
03554190017272252043741.jpg
Native Copper

Point Prospect, Grant Township, Keweenaw County, Michigan, USA
08014250017272252048231.jpg
Native Copper

Point Prospect, Grant Township, Keweenaw County, Michigan, USA
Latitude & Longitude (WGS84):
47° 25' 6'' North , 87° 46' 14'' West
Latitude & Longitude (decimal):
47.41861,-87.77083
GeoHash:
G#: f03tf8r1r
GRN:
N32W44
Type:
Prospect
Köppen climate type:
Dfb : Warm-summer humid continental climate
Nearest Settlements:
PlacePopulationDistance
Copper Harbor108 (2017)10.5km
Mindat Locality ID:
125492
Long-form identifier:
mindat:1:2:125492:4
GUID (UUID V4):
0


Vein outcrop located about 6 miles southeast of Copper Harbor. According to Rosemeyer and Carlson (2000), it was discovered in 1990 and produced some of the largest copper crystals found in the district from a trench 45 ft. long.
The initial exploration was conducted by collector Joe Ziolkowski and was "...jokingly called the 'Pole hole' in reference to Ziolkowski's ancestry, and early specimens that were sold carried this label." (Rosemeyer and Carlson, p. 224). Some of the largest native copper crystals in the world (up to fourteen pounds) have been recovered from this locality. The crystals show a modified dodecahedron form, in addition to an unidentified tetrahexahedron form. This locality is accessible.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List


12 valid minerals.

Detailed Mineral List:

ⓘ Analcime
Formula: Na(AlSi2O6) · H2O
ⓘ Azurite
Formula: Cu3(CO3)2(OH)2
ⓘ Calcite
Formula: CaCO3
ⓘ Chrysocolla
Formula: Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
ⓘ Cuprite
Formula: Cu2O
ⓘ Datolite
Formula: CaB(SiO4)(OH)
ⓘ Laumontite
Formula: CaAl2Si4O12 · 4H2O
ⓘ Malachite
Formula: Cu2(CO3)(OH)2
✪ Native Copper
Formula: Cu
Habit: Dodecahedrons to 6.4kg
ⓘ Prehnite
Formula: Ca2Al2Si3O10(OH)2
ⓘ Quartz
Formula: SiO2
ⓘ Tenorite
Formula: CuO

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
ⓘNative Copper1.AA.05Cu
Group 4 - Oxides and Hydroxides
ⓘCuprite4.AA.10Cu2O
ⓘTenorite4.AB.10CuO
ⓘQuartz4.DA.05SiO2
Group 5 - Nitrates and Carbonates
ⓘCalcite5.AB.05CaCO3
ⓘAzurite5.BA.05Cu3(CO3)2(OH)2
ⓘMalachite5.BA.10Cu2(CO3)(OH)2
Group 9 - Silicates
ⓘDatolite9.AJ.20CaB(SiO4)(OH)
ⓘPrehnite9.DP.20Ca2Al2Si3O10(OH)2
ⓘChrysocolla9.ED.20Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
ⓘAnalcime9.GB.05Na(AlSi2O6) · H2O
ⓘLaumontite9.GB.10CaAl2Si4O12 · 4H2O

List of minerals for each chemical element

HHydrogen
Hⓘ AnalcimeNa(AlSi2O6) · H2O
Hⓘ AzuriteCu3(CO3)2(OH)2
Hⓘ ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
Hⓘ DatoliteCaB(SiO4)(OH)
Hⓘ LaumontiteCaAl2Si4O12 · 4H2O
Hⓘ MalachiteCu2(CO3)(OH)2
Hⓘ PrehniteCa2Al2Si3O10(OH)2
BBoron
Bⓘ DatoliteCaB(SiO4)(OH)
CCarbon
Cⓘ AzuriteCu3(CO3)2(OH)2
Cⓘ CalciteCaCO3
Cⓘ MalachiteCu2(CO3)(OH)2
OOxygen
Oⓘ AnalcimeNa(AlSi2O6) · H2O
Oⓘ AzuriteCu3(CO3)2(OH)2
Oⓘ CalciteCaCO3
Oⓘ ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
Oⓘ CupriteCu2O
Oⓘ DatoliteCaB(SiO4)(OH)
Oⓘ LaumontiteCaAl2Si4O12 · 4H2O
Oⓘ MalachiteCu2(CO3)(OH)2
Oⓘ PrehniteCa2Al2Si3O10(OH)2
Oⓘ QuartzSiO2
Oⓘ TenoriteCuO
NaSodium
Naⓘ AnalcimeNa(AlSi2O6) · H2O
AlAluminium
Alⓘ AnalcimeNa(AlSi2O6) · H2O
Alⓘ ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
Alⓘ LaumontiteCaAl2Si4O12 · 4H2O
Alⓘ PrehniteCa2Al2Si3O10(OH)2
SiSilicon
Siⓘ AnalcimeNa(AlSi2O6) · H2O
Siⓘ ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
Siⓘ DatoliteCaB(SiO4)(OH)
Siⓘ LaumontiteCaAl2Si4O12 · 4H2O
Siⓘ PrehniteCa2Al2Si3O10(OH)2
Siⓘ QuartzSiO2
CaCalcium
Caⓘ CalciteCaCO3
Caⓘ DatoliteCaB(SiO4)(OH)
Caⓘ LaumontiteCaAl2Si4O12 · 4H2O
Caⓘ PrehniteCa2Al2Si3O10(OH)2
CuCopper
Cuⓘ AzuriteCu3(CO3)2(OH)2
Cuⓘ ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
Cuⓘ CupriteCu2O
Cuⓘ Native CopperCu
Cuⓘ MalachiteCu2(CO3)(OH)2
Cuⓘ TenoriteCuO

Other Regions, Features and Areas containing this locality

North AmericaContinent
North America PlateTectonic Plate
USA

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

Rosemeyer, Tom; Carlson, Shawn M. (2000) Mineralogy of Point Prospect, Keweenaw County, Michigan. Rocks & Minerals, 75 (4). 222-228 doi:10.1080/00357520009605647
Heinrich, E. W., Robinson, George Willard (2004) Mineralogy of Michigan (2nd ed.) A.E. Seaman Mineral Museum and Michigan Technological University. 252pp.
Kaminski-Hamka, T. (2011) The Copper Mines of Keweenaw County, Michigan. Copperlady Press. 150 pages.
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