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A mineralogical trip through the states of USA - Michigan
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John Jaszczak




Joined: 05 Oct 2010
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Location: Hancock, MI


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PostPosted: Sep 17, 2012 16:47    Post subject: Re: A mineralogical trip through the states of USA - Michigan  

Some excellent specimens of crystallized naive copper were collected by Bob Barron in Lake Superior's Great Sand Bay north of Eagle Harbor, Michigan. Tom Rosemeyer wrote a nice article about it in Rocks and Minerals vol. 84 (2009).


532_02sm.jpg
 Description:
Copper
Great Sand Bay, Eagle Harbor, Lake Superior, Michigan
3x4 cm
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532_04sm.jpg
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Copper
Great Sand Bay, Eagle Harbor, Lake Superior, Michigan
close up of what appears to be an octahedral crystal but is probably a dodecahedron...
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Bob Harman




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PostPosted: Jul 05, 2017 14:19    Post subject: Re: A mineralogical trip through the states of USA - Michigan  

In the sedimentary areas of the US Midwest there are several localities where MILLERITE (NiS) can reliably be found. Perhaps the best known locality is Hall's Gap Kentucky. The Harrodsburg road cuts in Monroe County Indiana is another well known locality as are several sites in the Keokuk geode area of Iowa, Illinois, and Missouri. Less well known is the Wallace Stone Quarry (Bayport Quarry) in Bayport Michigan, Huron County. This quarry is also one of very few Michigan geode sites in general.

The Michigan geodes, like those at the Hall's Gap locality, tend to be small and very small and chock full of intertwined fine silvery wires of the millerite. Here are 3 examples from the 1980s and 1990s, 1.8 cm - 2.4 cm. BOB



fullsizeoutput_2587.jpeg
 Mineral: Millerite on Quartz
 Locality:
Wallace Stone Company Quarry, Bay Port Michigan, Pigeon, Huron County, Michigan, USA
 Dimensions: 3 examples 1.8 cm - 2.4 cm
 Description:
 Viewed:  1542 Time(s)

fullsizeoutput_2587.jpeg



fullsizeoutput_258d.jpeg
 Mineral: Millerite on Quartz
 Locality:
Wallace Stone Company Quarry, Bay Port Michigan, Pigeon, Huron County, Michigan, USA
 Dimensions: 3 examples 1.8 cm - 2.4 cm
 Description:
 Viewed:  1567 Time(s)

fullsizeoutput_258d.jpeg



fullsizeoutput_25a0.jpeg
 Mineral: Millerite on Quartz
 Locality:
Wallace Stone Company Quarry, Bay Port Michigan, Pigeon, Huron County, Michigan, USA
 Dimensions: 1.8 cm
 Description:
 Viewed:  1564 Time(s)

fullsizeoutput_25a0.jpeg


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