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Jordi Fabre
Overall coordinator of the Forum
Joined: 07 Aug 2006
Posts: 5021
Location: Barcelona
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 Posted: Dec 19, 2009 16:48 Post subject: Hemimorphite |
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Your desires are orders for me Peter! ;-)
Jordi
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Hemimorphite with minor Mimetite
Mina Ojuela, Level 7, Mapimí, Municipio de Mapimí, Durango Mexico
Mined: 12/2004
Crystal size: 1.3 × 0.4 cm
Former T. L. Potucek collection
Photo: Reference Specimens -> http://www.fabreminerals.com/specimens/MEC-north-america-mineral-specimens.php#TM76L3 |
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41853 Time(s) |
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Hemimorphite
Santa Eulalia, Aquiles Serdán, Chihuahua Mexico
Crystal size: 2.9 × 0.7 cm
Photo: Reference Specimens -> http://www.fabreminerals.com/specimens/RSMEC-north-america-notable-specimens.php#TV66K0 |
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41884 Time(s) |
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Gail
Joined: 21 Feb 2008
Posts: 5839
Location: Texas, Lone Star State.
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| Posted: Dec 19, 2009 17:15 Post subject: Re: Hemimorphite |
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Gentlemen! I am ecstatic!
We are off to a party, but just ran over to take a few quick photos of some of my displayed pieces. What a treat to show the beauty of this incredible mineral.
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| I love the combination of milky and clear crystals. |
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| my "Poker chip" hemi. Sorry about the dark photo, but it shows off the growth patterns well. |
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Gail
Joined: 21 Feb 2008
Posts: 5839
Location: Texas, Lone Star State.
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| Posted: Dec 19, 2009 17:18 Post subject: Re: Hemimorphite |
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And more..
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| my hemimorphite shelf from the side... |
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Gail
Joined: 21 Feb 2008
Posts: 5839
Location: Texas, Lone Star State.
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| Posted: Dec 19, 2009 17:21 Post subject: Re: Hemimorphite |
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...
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41812 Time(s) |
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Carles Millan
Site Admin
Joined: 05 May 2007
Posts: 1531
Location: Catalonia
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| Posted: Dec 19, 2009 17:42 Post subject: Re: Hemimorphite |
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And here some more...
Full descriptions available at https://www.mineral-forum.com/message-board/viewtopic.php?p=6450#6450 and https://www.mineral-forum.com/message-board/viewtopic.php?p=6310#6310 (these links may not work fine with some versions of Microsoft Internet Explorer due to an unsolved bug).
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| From Ojuelo mine, Mapimí. Photo Carles Millan. |
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| From Ojuelo mine, Mapimí. Photo Carles Millan. |
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| From Santa Eulalia, Aquiles Serdán, Chihuahua. Photo Carles Millan |
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| From Santa Eulalia, Aquiles Serdán, Chihuahua. Photo Carles Millan |
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| From Santa Eulalia, Aquiles Serdán, Chihuahua. Photo Fabre Minerals |
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Peter Megaw
Site Admin
Joined: 13 Jan 2007
Posts: 973
Location: Tucson, Arizona
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| Posted: Dec 20, 2009 12:13 Post subject: Re: Hemimorphite |
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Here are a few Mexican hemis from my collection.
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| Monster Hemi crystals. Largest are 12 cm long. Oxide Zinc Orebody, Potosi Mine (see below for detailed info on this orebody) |
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| 4th Level San Antonio Mine, Santa Eulalia. Black specs are plattnerite and murdochite, some pieces from here have mimetite too. Large cabinet...hemi fan is 6 cm across |
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| X-Y-Z "coordinates...these three 5 cm xals are at almost 90 degrees to each other |
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| Shelf of minerals from the Oxide Zinc Orebody, 13-16th Levels, Potosi Mine, Santa Eulalia. Minerals from here include hemimorphite, calcite, willemite, chalcophanite, adamite and cerussite. This orebody runs 35% zinc and is almost completely composed of supergene zinc minerals. The bright red, brown and white calcite twins you see from SE come from this orebody...as well as teh stalactites over hematite (often mislabeled cinnabar) |
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| Ojuela Mine, cabinet specimen...12 cm across |
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| Hemimorphite. 12 cm across Bocoyna Mine, Cerro Las Minas, Guadalupe Victoria, Durango Mexico. Ex-Romero Collection. Note: workings from Bocoyna connect to the Santo Nino Mine, but the hemis come from sopes in Bocoyna |
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41750 Time(s) |
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Siempre Adelante! |
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strahler
Joined: 15 Feb 2009
Posts: 30
Location: Colorado
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| Posted: Dec 20, 2009 17:01 Post subject: Re: Hemimorphite |
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Peter,
When is the Mexico Min Rec with Santa Eulalia coming out, I heard you were leading the article?
Ryan Bowling
_________________
Regards,
Ryan Bowling |
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strahler
Joined: 15 Feb 2009
Posts: 30
Location: Colorado
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| Posted: Dec 20, 2009 17:03 Post subject: Re: Hemimorphite |
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Here is my contribution.
I too like the clear and opaque crystal combinations.
Best Regards,
Ryan
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41697 Time(s) |
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_________________
Regards,
Ryan Bowling |
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Peter Megaw
Site Admin
Joined: 13 Jan 2007
Posts: 973
Location: Tucson, Arizona
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| Posted: Dec 20, 2009 18:04 Post subject: Re: Hemimorphite |
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Did Wendell put you up to this...? This is a long-term work in progress, that I'd like to think I can finish this year...big subject to do justice to though
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strahler
Joined: 15 Feb 2009
Posts: 30
Location: Colorado
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| Posted: Dec 20, 2009 20:00 Post subject: Re: Hemimorphite |
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Peter,
No Wendell is not behind this one, just my interest on the topic. It is one district that I have always wanted to learn more about.
Take Care,
Ryan
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Ryan Bowling |
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Peter Megaw
Site Admin
Joined: 13 Jan 2007
Posts: 973
Location: Tucson, Arizona
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| Posted: Dec 21, 2009 02:28 Post subject: Re: Hemimorphite |
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Ryan, I was kiddling, Wendell bugs me about this every time I see him. Funny, learning more about Santa Eulalia is still high on my list too...I think half the system remains to be found
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Montanpark
Joined: 06 Nov 2008
Posts: 241
Location: Mainz
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| Posted: Dec 21, 2009 04:55 Post subject: Re: Hemimorphite |
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Hi all,
Peter, what great hemis from Sta. Eulalia!! My contribution looks very humble in comparison but it is one of my favourite specimens and i have it since around 20 years.
Santa Eulalia, Aquiles Serdán, Chihuahua. Size approx 15 x 15 cm.
cheers
Roger
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41497 Time(s) |
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Peter Megaw
Site Admin
Joined: 13 Jan 2007
Posts: 973
Location: Tucson, Arizona
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| Posted: Dec 21, 2009 11:10 Post subject: Re: Hemimorphite |
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Hey, I love the SE material that is coming out of the woodwork! But I'm not surprised, during the 80s the Oxide Zinc orebody effectively kept the Potosi Mine alive...mining 400 tpw for shipment to a fume smelter in Monterrey. They mined by hand and the orebody was essentially one flat-lying pocket above another, separated by high grade Zn-Fe-Mn ore. Many of the pockets had calcite linings, but almost as many had hemi linings. Miguel Romero got the biggest crystal I ever saw from there...it was 25 cm long...and ugly because it was heavily included with Mn-gunk.
Similar bodies, that have never been touched exist throughout the upper parts of the West Camp (Buena Tierra and Potosi Mines) and the San Antonio Mine in the East Camp. I have been in caverns 50m wide, 100m tall and 400m long that were completely lined with a crust of hemimorphite 15 cm thick! (again, most was ugly). And let's not forget the zone where you get the white rhobohedral calcites overgrowing hemi...very similar material from both Santa Eulalia and Ojuela. Much is mistakenly sold as "chabazite" thanks to some long-ago mineral dealer who insisted that's what it was...and the error sticks.
I'll load some more shots of hemis from the 4th Level of the San Antonio mine...and elsewhere if I have them
For those who read German...or like cool old crystal drawings...the following is a classic study on Santa Eulalia hemi
Seebach, M. and Paul, F.P., 1912, Uber Kieselzinkerz von Santa Eulalia bei Chihuahua, Mexico; ein Beitrag zur Kenntnis der Krystallformen dieses Mineral: Zeitschrift fur Krystallographie und Mineralogie, bd. 51,h. 2, p. 148-206, 3 pls.
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| Hemi and adamite, small minature, Oxide Zinc Orebody. There's a magnificent large piece from the same find figured in the Min Record "Freilich" issue. That lot was "stolen" from me...I had a handshake on the deal, another dealer showed up while I was waiting for the $ to be wired and offered three times what the guy had asked for the lot! Naturally, he got it...but the story has a happy ending. My source felt so bad about going back on his handhake that he sold me the next lot out of the pocket at his cost...and this turned out to be the best lot of purple adamites ever to come from Santa Eulalia! |
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| Minature, fan of hemi very heavily coated by plattnerite and murdochite. 4th Level San Antonio |
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| Botryoidal hemimorphite: 12 cm across, 4th Level San Antonio Mine, light plattnerite dusting. Self collected 1985 |
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Peter Megaw
Site Admin
Joined: 13 Jan 2007
Posts: 973
Location: Tucson, Arizona
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| Posted: Dec 21, 2009 14:04 Post subject: Re: Hemimorphite Ojuela...posted here though |
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Here's a small hemi from Ojuela in my collection
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41423 Time(s) |
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Tobi
Site Admin
Joined: 07 Apr 2009
Posts: 4235
Location: Germany
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| Posted: Dec 21, 2009 14:09 Post subject: Re: Hemimorphite |
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Peter, you must be very proud of your hemimorphites, they are absolutely superb! Please keep posting pictures of each single specimen, it is a pleasure to see this wonderful minerals.
Cheers!
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