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Jordi Fabre
Overall coordinator of the Forum
Joined: 07 Aug 2006
Posts: 5025
Location: Barcelona
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 Posted: Feb 27, 2011 12:24 Post subject: A mineralogical trip through the states of USA - Iowa |
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Iowa the "Hawkeye State"
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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! |
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34464 Time(s) |
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rweaver
Joined: 13 Apr 2009
Posts: 259
Location: Ridgecrest, California
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| Posted: Feb 27, 2011 12:50 Post subject: Re: A mineralogical trip through the states of USA - Iowa |
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Former collection of Harold Urish
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Fluorite on Calcite
Pints Quarry
Raymond, Iowa
4.8cm x 6.6cm |
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34416 Time(s) |
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rweaver
Joined: 13 Apr 2009
Posts: 259
Location: Ridgecrest, California
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| Posted: Feb 27, 2011 12:56 Post subject: Re: A mineralogical trip through the states of USA - Iowa |
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Former collection of Mary and Gardner Miller
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Calcite
Pershing, Iowa
6.0cm x 4.8cm |
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34355 Time(s) |
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Jordi Fabre
Overall coordinator of the Forum
Joined: 07 Aug 2006
Posts: 5025
Location: Barcelona
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| Posted: Nov 26, 2011 15:54 Post subject: Re: A mineralogical trip through the states of USA - Iowa |
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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
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Calcite
Linwood Mine, Buffalo, Scott County, Iowa, USA
5x3,9x2,8 cm. |
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33474 Time(s) |
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Calcite close up
Linwood Mine, Buffalo, Scott County, Iowa, USA |
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33450 Time(s) |
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cgoings
Joined: 03 Jun 2012
Posts: 2
Location: Washington
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| Posted: Jun 03, 2012 19:03 Post subject: Re: A mineralogical trip through the states of USA - Iowa |
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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
Joined: 24 Jun 2011
Posts: 34
Location: Minneapolis, Minnesota
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| Posted: Jun 03, 2012 20:08 Post subject: Re: A mineralogical trip through the states of USA - Iowa |
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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.
| Description: |
Baryte
Linwood Mine, Buffalo, Iowa, USA
12.5 cm X 7 cm, 4.5 cm thick. |
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32556 Time(s) |
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_________________
John K. Nash, Ph.D. |
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John Nash
Joined: 24 Jun 2011
Posts: 34
Location: Minneapolis, Minnesota
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| Posted: Jun 03, 2012 22:09 Post subject: Re: A mineralogical trip through the states of USA - Iowa |
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Here's a nice calcite from the Linwood Mine.
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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. |
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32563 Time(s) |
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_________________
John K. Nash, Ph.D. |
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John Nash
Joined: 24 Jun 2011
Posts: 34
Location: Minneapolis, Minnesota
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| Posted: Jun 03, 2012 22:16 Post subject: Re: A mineralogical trip through the states of USA - Iowa |
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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.
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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. |
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32590 Time(s) |
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_________________
John K. Nash, Ph.D. |
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Matt_Zukowski
Site Admin
Joined: 10 Apr 2009
Posts: 737
Location: Alaska
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| Posted: Jun 03, 2012 22:49 Post subject: Re: A mineralogical trip through the states of USA - Iowa |
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John inspired me to upload photos of a Linwood piece I have.
| Description: |
Calcite
Linwood Mine, Buffalo, Scott Co., Iowa, USA
32 x 15 x 14 cm |
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32578 Time(s) |
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| Description: |
Calcite
Linwood Mine, Buffalo, Scott Co., Iowa, USA
Twin is 5 x 4.5 cm |
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32587 Time(s) |
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| Description: |
Caclite
Linwood Mine, Buffalo, Scott Co., Iowa, USA
Twin is 5 x 4.5 cm |
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32552 Time(s) |
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am mizunaka
Joined: 09 Apr 2010
Posts: 2184
Location: USA
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| Posted: Sep 07, 2012 03:31 Post subject: Re: A mineralogical trip through the states of USA - Iowa |
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The locality for this piece was vague. The label simply says "Near Ollie, Iowa".
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Millerite with Calcite
Keokuk Co., Iowa, USA
5 x 4 x 3.8 cm |
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31915 Time(s) |
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| Description: |
Millerite with Calcite
Keokuk Co., Iowa, USA
Detail |
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31862 Time(s) |
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Bob Harman
Joined: 06 Nov 2015
Posts: 765
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| Posted: Jun 12, 2016 08:25 Post subject: Re: A mineralogical trip through the states of USA - Iowa |
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As part of my U.S.A. sub-collection here is an example of a small interesting Keokuk Iowa geode.
| Mineral: | Calcite, Aragonite and Dolomite (variety ferroan) on Quartz |
| Locality: | | Keokuk, Lee County, Iowa, USA |  |
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| Dimensions: | geode is about 3.3 cm, calcite is 0.7 cm, aragonite spray is 1.3 cm |
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| calcite, aragonite and decayed ferroan dolomite on quartzThe so called "blue quartz" variety with calcite adjacent to an aragonite spray. This is unusual |
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24631 Time(s) |
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| Mineral: | Calcite, Aragonite and Dolomite (variety ferroan) on Quartz |
| Locality: | | Keokuk, Lee County, Iowa, USA | |
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| 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. |
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24679 Time(s) |
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