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A mineralogical trip through the states of USA - Iowa
  
  Index -> A mineralogical trip through the states of USA
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Jordi Fabre
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PostPosted: Feb 27, 2011 12:24    Post subject: A mineralogical trip through the states of USA - Iowa  

Iowa the "Hawkeye State"




Millerite - Kaser Quarry Ollie Keokuk County Iowa USA.jpg
 Description:
Millerite
Kaser Quarry, Ollie, Keokuk County, Iowa, USA
Field of view is 3.8cm.
Photo: Jim Prentiss

A "cat's hair" Millerite from Jim Prentiss (http://www.mineral-forum.com/message-board/viewtopic.php?p=8866#8866)
Thanks Jim!
 Viewed:  21762 Time(s)

Millerite - Kaser Quarry Ollie Keokuk County Iowa USA.jpg


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PostPosted: Feb 27, 2011 12:50    Post subject: Re: A mineralogical trip through the states of USA - Iowa  

Former collection of Harold Urish


DSCN0590.JPG
 Description:
Fluorite on Calcite
Pints Quarry
Raymond, Iowa
4.8cm x 6.6cm
 Viewed:  21761 Time(s)

DSCN0590.JPG


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PostPosted: Feb 27, 2011 12:56    Post subject: Re: A mineralogical trip through the states of USA - Iowa  

Former collection of Mary and Gardner Miller


DSCN0604.JPG
 Description:
Calcite
Pershing, Iowa
6.0cm x 4.8cm
 Viewed:  21695 Time(s)

DSCN0604.JPG


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PostPosted: Nov 26, 2011 15:54    Post subject: Re: A mineralogical trip through the states of USA - Iowa  

An interesting Calcite with oriented inclusions of Marcasite published by Edelmin in FMF Spain -> https://www.foro-minerales.com/forum/viewtopic.php?p=39342#39342


Calcite - Linwood Mine_Buffalo_Scott County_Iowa_USA.jpg
 Description:
Calcite
Linwood Mine, Buffalo, Scott County, Iowa, USA
5x3,9x2,8 cm.
 Viewed:  20777 Time(s)

Calcite - Linwood Mine_Buffalo_Scott County_Iowa_USA.jpg



Calcite close up - Linwood Mine_Buffalo_Scott County_Iowa_USA.jpg
 Description:
Calcite close up
Linwood Mine, Buffalo, Scott County, Iowa, USA
 Viewed:  20803 Time(s)

Calcite close up - Linwood Mine_Buffalo_Scott County_Iowa_USA.jpg


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PostPosted: Jun 03, 2012 19:03    Post subject: Re: A mineralogical trip through the states of USA - Iowa  

Hello all:

I thought you might be interested in some chert exposure maps I am creating for Iowa. I am doing it one county at a time and have Henry and Washington counties done. I am working on Louisa County right now. It takes awhile to publish each map because I am ground-truthing as I go. You can go to:
https://www.rollinghillsconsulting.com
(link normalized by FMF)
and click on County Chert Maps to access them. If you follow RHCS on Facebook, you will be notified when the next map is up.

Hope this is helpful!

Chad
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John Nash




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PostPosted: Jun 03, 2012 20:08    Post subject: Re: A mineralogical trip through the states of USA - Iowa  

This is a huge, gemmy Baryte, the best I've seen so far from the Linwood mine. It is a cluster of large, parallel growth twin crystals, two of which show double terminations and are 10.5 cm long. One stands higher than the others, making the whole specimen 12.5 cm X 7 cm, 4.5 cm thick. The Baryte's color could be mistaken for smoky quartz and it shows very good transparency for such a large Baryte. You can see your finger through it. A remarkable addition to our "monumental" Baryte collection. I mounted it in a removable base to stand it up.


1938full1.jpg
 Description:
Baryte
Linwood Mine, Buffalo, Iowa, USA
12.5 cm X 7 cm, 4.5 cm thick.
 Viewed:  19922 Time(s)

1938full1.jpg



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John Nash




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PostPosted: Jun 03, 2012 22:09    Post subject: Re: A mineralogical trip through the states of USA - Iowa  

Here's a nice calcite from the Linwood Mine.


1015fulla450.jpg
 Description:
Calcite with pyrite inclusions
Linwood Mine, Buffalo, Iowa, USA
12.5 X 8 X 6 cm.
Incredible clear calcite crystals with tiny, sparkling pyrite crystals inside. Truly remarkable.
 Viewed:  19937 Time(s)

1015fulla450.jpg



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John Nash




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PostPosted: Jun 03, 2012 22:16    Post subject: Re: A mineralogical trip through the states of USA - Iowa  

One more, a lovely double terminated Baryte group on limestone from the Linwood Mine. The Linwood mine produces some interesting Baryte and very fine calcites and Barytes. This one consists of a remarkable group of gemmy smoky Barytes with glassy surfaces, well separated and beautifully defined on a limestone matrix, a very aesthetic specimen.


1894full3.jpg
 Description:
Baryte on limestone
Linwood Mine, Buffalo, Iowa, USA
The specimen is about 11 X 6.5 X 2.5 cm
The largest crystal is 8 cm long, 2 cm thick and doubly terminated, as are most of the smaller crystals. There are crystals on both sides of the limestone.
 Viewed:  19955 Time(s)

1894full3.jpg



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PostPosted: Jun 03, 2012 22:49    Post subject: Re: A mineralogical trip through the states of USA - Iowa  

John inspired me to upload photos of a Linwood piece I have.


0048 Calcite Linwwod 1.JPG
 Description:
Calcite
Linwood Mine, Buffalo, Scott Co., Iowa, USA
32 x 15 x 14 cm
 Viewed:  19943 Time(s)

0048 Calcite Linwwod 1.JPG



0048 Calcite Linwwod 2.jpg
 Description:
Calcite
Linwood Mine, Buffalo, Scott Co., Iowa, USA
Twin is 5 x 4.5 cm
 Viewed:  19958 Time(s)

0048 Calcite Linwwod 2.jpg



0048 Calcite Linwwod 3.jpg
 Description:
Caclite
Linwood Mine, Buffalo, Scott Co., Iowa, USA
Twin is 5 x 4.5 cm
 Viewed:  19927 Time(s)

0048 Calcite Linwwod 3.jpg


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am mizunaka




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PostPosted: Sep 07, 2012 03:31    Post subject: Re: A mineralogical trip through the states of USA - Iowa  

The locality for this piece was vague. The label simply says "Near Ollie, Iowa".


OllieMillerite.jpg
 Description:
Millerite with Calcite
Keokuk Co., Iowa, USA
5 x 4 x 3.8 cm
 Viewed:  19235 Time(s)

OllieMillerite.jpg



OllieDet.jpg
 Description:
Millerite with Calcite
Keokuk Co., Iowa, USA
Detail
 Viewed:  19223 Time(s)

OllieDet.jpg


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PostPosted: Jun 12, 2016 08:25    Post subject: Re: A mineralogical trip through the states of USA - Iowa  

As part of my U.S.A. sub-collection here is an example of a small interesting Keokuk Iowa geode.


DSC02894.jpg
 Mineral: Calcite, Aragonite and Dolomite (variety ferroan) on Quartz
 Locality:
Keokuk, Lee County, Iowa, USA
 Dimensions: geode is about 3.3 cm, calcite is 0.7 cm, aragonite spray is 1.3 cm
 Description:
calcite, aragonite and decayed ferroan dolomite on quartzThe so called "blue quartz" variety with calcite adjacent to an aragonite spray. This is unusual
 Viewed:  11995 Time(s)

DSC02894.jpg



DSC02895.jpg
 Mineral: Calcite, Aragonite and Dolomite (variety ferroan) on Quartz
 Locality:
Keokuk, Lee County, Iowa, USA
 Dimensions: geode is about 3.3 cm, calcite is 0.7 cm, aragonite spray is 1.3 cm
 Description:
The so called "blue quartz" variety with calcite adjacent to an aragonite spray. This is unusual.
 Viewed:  11984 Time(s)

DSC02895.jpg


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