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A mineralogical trip through the states of USA - Minnesota
  
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Jordi Fabre
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PostPosted: Apr 07, 2011 10:13    Post subject: A mineralogical trip through the states of USA - Minnesota  

Minnesota, the "North Star State"




Calcite - Hovland_Cook County_Minnesota_USA.jpg
 Description:
Calcite
Hovland, Cook County, Minnesota, USA
6.6 cm. x 5.2 cm.
Photo: Bob Weaver

One image of a Calcite, kindly supplied by Bob Weaver for Minessota, a state where apparently is hard to find minerals from.

Again, thank you Bob!
 Viewed:  20283 Time(s)

Calcite - Hovland_Cook County_Minnesota_USA.jpg


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PostPosted: Apr 07, 2011 19:12    Post subject: Re: A mineralogical trip through the states of USA - Minnesota  

Bought through an auction


DSCN0798.JPG
 Description:
Copper on Calcite
St Louis Co., Minnesota
3.8cm x 3.1cm
 Viewed:  20193 Time(s)

DSCN0798.JPG


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PostPosted: Apr 07, 2011 19:15    Post subject: Re: A mineralogical trip through the states of USA - Minnesota  

rare from the state


DSCN0793.JPG
 Description:
Rhodochrosite
St. Louis Co., Minnesota
4.2cm x 3.1cm
 Viewed:  20256 Time(s)

DSCN0793.JPG


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PostPosted: Apr 07, 2011 19:17    Post subject: Re: A mineralogical trip through the states of USA - Minnesota  

Nice rhodo and copper specimens. I though only ice cubes came from Minne-so-cold. ;=)
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PostPosted: Apr 07, 2011 19:20    Post subject: Re: A mineralogical trip through the states of USA - Minnesota  

My last one from the state


DSCN0800.JPG
 Description:
Groutite
Robert Mine,
Cuyuna Iron Range, Crow Wing Co.,
Minnesota
4.0cm x 4.0cm
 Viewed:  20201 Time(s)

DSCN0800.JPG



DSCN0801.JPG
 Description:
Groutite
Robert Mine,
Cuyuna Iron Range, Crow Wing Co.,
Minnesota
4.0cm x 4.0cm
 Viewed:  20215 Time(s)

DSCN0801.JPG


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PostPosted: Nov 26, 2011 20:50    Post subject: Re: A mineralogical trip through the states of USA - Minnesota  

Minnesota is not known for having much beyond agates for mineral collectors. However, it turns out that if one is persistent, interesting finds can be had in the lava flows along the North Shore (the north eastern coast along Lake Superior). I thank Mike Hedtke for showing me one terrific locality, the Knife River. I thank persistence and luck for the rest! Here are a number of my Minnesota specimens, beginning with those from the Knife River.


1896full1.jpg
 Description:
Natrolite
Knife River, St. Louis County, Minnesota, USA
9 X 6 X 3.5 cm
A 4.5 cm pocket filled with natrolite or a closely related species.
 Viewed:  19143 Time(s)

1896full1.jpg



1892close1.jpg
 Description:
Copper, minor chrysocolla
Knife River, St. Louis County, Minnesota, USA
Specimen 12 X 9 X 6 cm
Field of view is about 4 cm, the main rough crystal is 2.5 cm and protrudes up out of the matrix.
 Viewed:  19134 Time(s)

1892close1.jpg



1497close2.jpg
 Description:
Kinoite in calcite
Knife River, St. Louis County, Minnesota, USA
Specimen 7 X 6 X 5 cm, Field of view 2 cm
A one time find of kinoite in calcite.
 Viewed:  19130 Time(s)

1497close2.jpg



1481full1.jpg
 Description:
Prehnite epimorphs of laumontite
Knife River, St. Louis County, Minnesota, USA
6 X 5 X 4 cm
Beautiful orange prehnite epimorphs of laumontite.
 Viewed:  19124 Time(s)

1481full1.jpg



1481med1.jpg
 Description:
Prehnite epipmorphs of laumontite
Knife River, St. Louis County, Minnesota, USA
5 cm field of view
 Viewed:  19137 Time(s)

1481med1.jpg



1482close1.jpg
 Description:
Prehnite
Knife River, St. Louis County, Minnesota, USA
Field of view 2.5 cm
Most remarkable iridescent orange prehnite, metallic blue and purple flashes are amazing in person. I've found only a few examples in 5 years of visiting the locale.
 Viewed:  19151 Time(s)

1482close1.jpg



1796full1.jpg
 Description:
Prehnite, minor copper
Knife River, St. Louis County, Minnesota, USA
8 X 6 X 5 cm
Gemmy light green prehnite, some copper inside.
 Viewed:  19123 Time(s)

1796full1.jpg



1769full2.jpg
 Description:
Prehnite
Knife River, St. Louis County, Minnesota, USA
9 X 7 X 4
Orange iridescent prehnite. So lovely in person, look at the close-up! Another one-time find, one boulder from the river, discovered by my son Greg.
 Viewed:  19158 Time(s)

1769full2.jpg



1769close3.jpg
 Description:
Prehnite
Knife River, St. Louis County, Minnesota, USA
Field of view about 6 cm
The light blue iridescence on this orange prehnite is stunning.
 Viewed:  19142 Time(s)

1769close3.jpg



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PostPosted: Nov 26, 2011 21:23    Post subject: Re: A mineralogical trip through the states of USA - Minnesota  

Here are examples of wonderful finds from the North Shore of Minnesota. I've found these calcites and apophyllites with my son Greg, plus one huge calcite from an agate dealer. I haven't seen well-crystallized apophyllite from Minnesota before.


1739full3.jpg
 Description:
Apophyllite on calcite
Onion River, near Lutsen, Cook County, Minnesota, USA
3.5 X 3 X 3 cm
A stubby little calcite crystal with many clear apophyllites growing on the top.
 Viewed:  19138 Time(s)

1739full3.jpg



1738full2.jpg
 Description:
Apophyllite on calcite
Onion River, near Lutsen, Cook County, Minnesota, USA
6.5 X 4 X 4 cm
A fine calcite crystal with a number of clear apophyllites on it.
 Viewed:  19156 Time(s)

1738full2.jpg



1737full1.jpg
 Description:
Calcite with apophyllite
Onion River, near Lutsen, Cook County, Minnesota, USA
9 X 7 X 6 cm
Two calcites, entwined like lovers, with a few apophyllites.
 Viewed:  19140 Time(s)

1737full1.jpg



1735full3.jpg
 Description:
Calcite and laumontite
Onion River, near Lutsen, Cook County, Minnesota, USA
3 X 1.5 cm
From the same pocket as the apophyllite.
 Viewed:  19123 Time(s)

1735full3.jpg



1736close2.jpg
 Description:
Apophyllite
Onion River, near Lutsen, Cook County, Minnesota, USA
Field of view 3 cm
A close up of the apophyllite showing the clarity.
 Viewed:  19140 Time(s)

1736close2.jpg



0443full1hand.jpg
 Description:
Calcite in laumontite
Near Beaver Bay, Lake County, Minnesota, USA
25 X 18 X 16 cm
Ex-Roland Quinn, proprietor of the Beaver Bay Agate Shop at the time. Roland inherited the shop and collection from his father. This incredible specimen has a group of flat-topped pseudohexagonal calcites in a large boulder of calcite and laumontite. It clearly was a piece of a large calcite vein that broke off. The miracle is that the whole specimen looks like a water-worn rock, but the calcite crystals are pristine and undamaged, showing no signs of wear at all. Greg theorizes this must have been in a part of Lake Superior with a sandy bottom. The usual pebble bottoms would have made short work of the calcite. The largest crystal is about 6 cm across. A true Minnesota classic, rare beyond rare.
 Viewed:  19111 Time(s)

0443full1hand.jpg



0443close2.jpg
 Description:
Calcite in laumontite
Near Beaver Bay, Lake County, Minnesota, USA
Largest crystal is 6 cm
 Viewed:  19129 Time(s)

0443close2.jpg



1012fulla.jpg
 Description:
Calcite
Near Crystal Creek, Minnesota, USA
15 X 10 X 8 cm
A group of scalenohedral calcites, the largest is 4 cm, sitting in a vug of greenish quartz. Found by my son Greg in a rock slide at a road cut through the North Shore basalt.
 Viewed:  19128 Time(s)

1012fulla.jpg



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PostPosted: Nov 26, 2011 22:13    Post subject: Re: A mineralogical trip through the states of USA - Minnesota  

Just one more thing for now, pectolite from Castle Danger, MN. The "rock yard" where tailings were dumped as early as 1920 from highway construction along the North Shore yielded these interesting specimens.


1786full1.jpg
 Description:
Pectolite
Castle Danger, the Rock Yard, Minnesota, USA
About 5 X 9 X 9 cm
Radiating clusters of Pectolite crystals and another mineral, possibly xonotlite, in a dark green mix of augite and plagioclase altered to prehnite. About 5 X 9 X 9 cm, the specimen is an amygdule containing the pectolite, surrounded by prehnite. This was described in a 1924 article by G. M. Schwartz of the U of MN in the American Mineralogist, pp. 83 - 88.
 Viewed:  19117 Time(s)

1786full1.jpg



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PostPosted: Nov 26, 2011 23:30    Post subject: Re: A mineralogical trip through the states of USA - Minnesota  

One last specimen to represent Minnesota - until next collecting season - some bright orange analcime. One large (20 cm) boulder discovered by my son Greg produced this and a number of other lovely specimens. Greg has very sharp eyes for the minerals ever since he started at age 11. Now he's 22.


1898full1.jpg
 Description:
Analcime
Knife River, St. Louis County, Minnesota, USA
The specimen is about 7.5 X 8 X 6 cm.
The analcite crystals are quite small, only about 2mm. See the close-up.
 Viewed:  19130 Time(s)

1898full1.jpg



1898close5.jpg
 Description:
Analcime
Knife River, St. Louis County, Minnesota, USA
The specimen is about 7.5 X 8 X 6 cm.
Field of view is about 3.5 cm
 Viewed:  19088 Time(s)

1898close5.jpg



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PostPosted: Nov 27, 2011 04:53    Post subject: Re: A mineralogical trip through the states of USA - Minnesota  

John Nash wrote:

...yes, I posted the apophyllites with calcite - and others - to the Minnesota minerals section, I thought the state should look a little better mineralogically!


Much better John, thank you. Great additions for Minnesota!
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PostPosted: Nov 28, 2011 00:24    Post subject: Re: A mineralogical trip through the states of USA - Minnesota  

One more from the Knife River, just now trimmed and cleaned.


1899full1.jpg
 Description:
Prehnite
Knife River, St. Louis County, Minnesota, USA
19.5 X 10 X 10 cm approximately
This orange prehnite shows partial casts after laumontite, the largest cast is about 2 cm. The prehnite glitters with gold and some blue iridescence.
 Viewed:  19007 Time(s)

1899full1.jpg



1899close2.jpg
 Description:
Prehnite
Knife River, St. Louis County, Minnesota, USA
Field of view 11 cm
 Viewed:  19002 Time(s)

1899close2.jpg



1899close1.jpg
 Description:
Prehnite
Knife River, St. Louis County, Minnesota, USA
Field of view 4.5 cm
 Viewed:  19005 Time(s)

1899close1.jpg



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PostPosted: Jan 20, 2012 12:44    Post subject: Re: A mineralogical trip through the states of USA - Minnesota  

A fine addition from Jeff Scovil: six candies, all of them from Soudan Mine.

As always, thank you so much Jeff!



Quartz on matrix - Soudan Mine_Soudan_Vermilion Range_St. Louis Co._Minnesota_USA.jpg.jpg
 Description:
Quartz with Hematite and Pyrite
Soudan Mine, Soudan, Vermilion Range, St. Louis Co., Minnesota, USA
6.5 wide
From Don & Gloria Olson
Photo: Jeff Scovil
 Viewed:  18458 Time(s)

Quartz on matrix - Soudan Mine_Soudan_Vermilion Range_St. Louis Co._Minnesota_USA.jpg.jpg



Quartz & Hematite - Soudan Mine_Soudan_Vermilion Range_St. Louis Co._Minnesota_USA.jpg.jpg
 Description:
Quartz and Hematite
Soudan Mine, Soudan, Vermilion Range, St. Louis Co., Minnesota, USA
4 cm. high
From Don & Gloria Olson
Photo: Jeff Scovil
 Viewed:  18471 Time(s)

Quartz & Hematite - Soudan Mine_Soudan_Vermilion Range_St. Louis Co._Minnesota_USA.jpg.jpg



Quartz with inclusions - Soudan Mine_Soudan_Vermilion Range_St. Louis Co._Minnesota_USA.jpg.jpg
 Description:
Quartz and Hematite
Soudan Mine, Soudan, Vermilion Range, St. Louis Co., Minnesota, USA
4.2 cm. high
From Don & Gloria Olson
Photo: Jeff Scovil
 Viewed:  18495 Time(s)

Quartz with inclusions - Soudan Mine_Soudan_Vermilion Range_St. Louis Co._Minnesota_USA.jpg.jpg



Doubly terminated Quartz - Soudan Mine_Soudan_Vermilion Range_St. Louis Co._Minnesota_USA.jpg.jpg
 Description:
Quartz and Hematite
Soudan Mine, Soudan, Vermilion Range, St. Louis Co., Minnesota, USA
2.7 cm. wide
From Don & Gloria Olson
Photo: Jeff Scovil
 Viewed:  18533 Time(s)

Doubly terminated Quartz - Soudan Mine_Soudan_Vermilion Range_St. Louis Co._Minnesota_USA.jpg.jpg



Quartz & inclusions - Soudan Mine_Soudan_Vermilion Range_St. Louis Co._Minnesota_USA.jpg
 Description:
Quartz and Hematite inclusions
Soudan Mine, Soudan, Vermilion Range, St. Louis Co., Minnesota, USA
3.6 high
From Don & Gloria Olson
Photo: Jeff Scovil
 Viewed:  18493 Time(s)

Quartz & inclusions - Soudan Mine_Soudan_Vermilion Range_St. Louis Co._Minnesota_USA.jpg



Quartz - Soudan Mine_Soudan_Vermilion Range_St. Louis Co._Minnesota_USA.jpg
 Description:
Quartz
Soudan Mine, Soudan, Vermilion Range, St. Louis Co., Minnesota, USA
9.5 cm. high
From Don & Gloria Olson
Photo: Jeff Scovil
 Viewed:  18467 Time(s)

Quartz - Soudan Mine_Soudan_Vermilion Range_St. Louis Co._Minnesota_USA.jpg


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PostPosted: Aug 11, 2012 23:35    Post subject: Re: A mineralogical trip through the states of USA - Minnesota  

Some summer finds from Minnesota


pectolite2.jpg
 Description:
Pectolite and apophyllite
Castle Danger, Minnesota, USA
The pectolite spray is 2 cm across
 Viewed:  16854 Time(s)

pectolite2.jpg



apophyllite calcite.jpg
 Description:
Apophyllite
Castle Danger, Minnesota, USA
The apophyllites are about 2 cm
These are part of a large (40 cm) rock (coarsely crystallized gabbro) found last weekend on the coast of Lake Superior that split perfectly down the middle revealing a number of pockets. Now for some extensive work with the rock trimmer to turn these into specimens.
 Viewed:  16885 Time(s)

apophyllite calcite.jpg



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