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Keweenaw peninsula, Michigan, USA

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The lower peninsula contains the Michigan Basin, an area of sedimentary rocks covered by glacial deposits. The upper peninsula is more mineralogically diverse with large deposits of native copper (the Keweenaw peninsula) in Keweenaw, Houghton and Ontonagon counties. Precambrian iron formation was mined in the Gogebic, Marquette and Menominee iron ranges in Gogebic, Iron, Dickinson and Marquette counties. There are also kimberlites and gold deposits in this part of the state.

This general locality has been created so people who have copper, silver and other specimens from the Keweenaw peninsula but with no specific known locality can associate images with this locality and not have to take a guess and hope that they come from say Keweenaw County. The specimens have a much better chance of having been found in Keweenaw, Houghton and Ontonagon counties than just taking a guess at one of the more specific localities.
[Rock Currier 2009]



References:
- E. W. Heinrich and G. W. Robinson (2004): Mineralogy of Michigan, xx pp.





Mineral List:
  		•  Analcime
    Na
     
    2
    		[Al
     
    2
    		Si
     
    4
    		O
     
    12
    		] · 2H
     
    2
    		O
    Reference: [My general knowledge-Rock Currier]
  		•  Calcite
    CaCO
     
    3
    Reference: [My general knowledge-Rock Currier]
  		•  'Coal
    var: Bituminous Coal'
    Reference: [Field Guide of Common Rocks and Minerals - Fredrick Brewster Loomis-1948]
  		•  Copper
    Cu
    Description: Can be found throughout the Upper peninsula (especially south of the Keweenaw) as float copper that was eroded from the Keweenaw peninsula deposits
    Reference: [Mineralogy of Michigan (2004) Heinrich & Robinson; My general knowledge-Rock Currier]
    Site Photo
    Keweenaw peninsula, Michigan, USA
    © Joseph A. Freilich
  		•  Datolite
    CaB[OH|SiO
     
    4
    		]
    Reference: [My general knowledge-Rock Currier]
    Site Photo
    Keweenaw peninsula, Michigan, USA
     
  		•  Epidote
    {Ca
     
    2
    		}{Al
     
    2
    		Fe
    3+
     
    		}[O|OH|SiO
     
    4
    		|Si
     
    2
    		O
     
    7
    		]
    Reference: [My general knowledge-Rock Currier]
  		•  Microcline
    var: Ferruginous Microcline
    Reference: [AmMin 24:643-650 (1939)]
  		•  Natrolite
    Na
     
    2
    		[Al
     
    2
    		Si
     
    3
    		O
     
    10
    		] · 2H
     
    2
    		O
    Reference: [My general knowledge-Rock Currier]
  		•  'Petoskey Stone'
    Description: Found in outcrops of Gravel Point formation near Petoskey, but scattered by glaciers around Lakes Michigan and Huron as well as other areas of the lower peninsula.
    Reference: [Mineralogy of Michigan (2004) Heinrich & Robinson]
    Site Photo
    Keweenaw peninsula, Michigan, USA
    © 2002 John H. Betts
  		•  Prehnite
    Ca
     
    2
    		Al
     
    2
    		Si
     
    3
    		O
     
    12
    		(OH)
    Reference: [My general knowledge-Rock Currier]
  		•  Quartz
    SiO
     
    2
    Reference: [My general knowledge-Rock Currier]
  		•  Silver
    Ag
    Reference: [My general knowledge-Rock Currier]
    Site Photo
    Keweenaw peninsula, Michigan, USA
     
  		•  Vermiculite
    (Mg,Fe,Al)
     
    3
    		(Al,Si)
     
    4
    		O
     
    10
    		(OH)
     
    2
    		·4H
     
    2
    		O
    Description: In Lake Superior clays
    Reference: [Mineralogy of Michigan (2004) Heinrich & Robinson]
  		•  Vivianite
    Fe
    2+
    3
    		(PO
     
    4
    		)
     
    2
    		·8H
     
    2
    		O
    Description: Cores from Lake Superior
    Reference: [Mineralogy of Michigan (2004) Heinrich & Robinson]


    14 entries listed. 11 valid minerals.

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    Copyright © Jolyon Ralph and Ida Chau 1993-2009. Jobs in Michigan, USA Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 25th Nov 2009 18:50:59