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Colorless Wulfenite
  
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Peter Megaw
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PostPosted: Dec 28, 2008 12:20    Post subject: Colorless Wulfenite  

This thread was fired by the "silver wulfenite" question...

Richard Bideaux, who studied wulfenite extensively thoughout his career/life, used to maintain to me that although synthetic PbMoO4 was colorless, truly colorless natural wulfenite was extremely rare. He noted most Tsumeb material, although very palid, still shows some color.

Shortly before he died I acquired 5 pieces of wulfenite from the West Camp of Santa Eulalia, Chihuahua, Mexico that appears completely colorless...see picture. Richard agreed with that assessment and noted he had never seen larger. (He was however astonished to see yellow mimetite with it... noting that the mimetite should be colorless as well!)

I'm interested who has seen examples of colorless wulfenite from other localities, or perhaps it might be more interesting to see how much of the spectrum can actually be covered by colored wulfenites...whether by iniclusions or chemistry. ROY is easy and G not difficult. True BIV anyone???



colorlesswulfenite2web.gif
 Description:
Largest crystals are about 6 mm across
 Viewed:  37604 Time(s)

colorlesswulfenite2web.gif



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PostPosted: Dec 28, 2008 13:32    Post subject: Re: Colorless Wulfenite  

Casually, in the last Tucson Show and in an obscure Hotel's room I got a colorless Tsumeb Wulfenite, really large, about 2.5 cm. Unfortunately I haven't it, but although I'm not sure, I have the idea that I did a photo of it. If I find it, I will publish it here.

Hopefully it helps,

Jordi
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PostPosted: Dec 30, 2008 16:51    Post subject: Re: Colorless Wulfenite  

I'm sorry, finally I have not the photo of the colorless Wulfenite from Tsumeb.

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PostPosted: Dec 30, 2008 17:35    Post subject: Re: Colorless Wulfenite  

Peter,

Your picture really amazes me! I presume that between you and Richard Bideaux, there is no uncertainty about it's being wulfenite....

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PostPosted: Dec 30, 2008 17:40    Post subject: Re: Colorless Wulfenite  

Pete...we zapped it...it is.

BTW do you still have those cool drawings of the calcite on calcite "mariposa" growht from Santa Eulalia...I would like to use them in a paper....with credit of course

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PostPosted: Dec 31, 2008 02:53    Post subject: Re: Colorless Wulfenite  

Pete Richards tried to publish the message below, but our antispam system avoid it due the email address. I already write it on the way that our antispam system can accept it. Please see: https://www.mineral-forum.com/message-board/viewtopic.php?t=74

BTW, Pete, in Spanish language mariposa = butterfly.

This is the Pete's message:

I got lots a drawings if I can just find them... Can you send me a sketch or something? I'm not sure what you mean by "mariposa" morphology - no hablo Espanol!

Send to rpr(at)heidelberg(dot)edu

Cheers!
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Jojm




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PostPosted: Dec 31, 2008 11:31    Post subject: Re: Colorless Wulfenite  

I've got a sample from San Rafael mine in Nevada (mindat.org locality 40175) with very tiny and nearly colorless wulfenites.
There are some others pictures on this locality photo gallery.



mimetite_wulfenite.jpg
 Description:
Mimetite and wulfenite
San Rafael Mine, Quartz Mountain camp, Lodi District, Nye Co., Nevada, USA
FOV: 1mm
 Viewed:  37466 Time(s)

mimetite_wulfenite.jpg



wulfenite.jpg
 Description:
Wulfenite
San Rafael Mine, Quartz Mountain camp, Lodi District, Nye Co., Nevada, USA
FOV: 1mm
 Viewed:  37447 Time(s)

wulfenite.jpg


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John S. White
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PostPosted: Dec 31, 2008 12:03    Post subject: Re: Colorless Wulfenite  

In reply to Pete Richards' query, the Handbook of Mineralogy by Anthony, Bideaux, Bladh and Nichols, list colorless as one of wulfenite's "colors."
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PostPosted: Dec 31, 2008 13:18    Post subject: Re: Colorless Wulfenite  

Jojm...cool colorless wulfenite...have you checked the "mimetites" to see whether they might actually be hedyphane?
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PostPosted: Jan 01, 2009 07:44    Post subject: Re: Colorless Wulfenite  

A colourless Wulfenite from Tsumeb is illustrated at:

https://www.williampinch.com
(link normalized by FMF)

Look under Tsumeb collection and find the Mawbyite & Wulfenite specimen.


All the best

Claus

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PostPosted: Jan 01, 2009 09:49    Post subject: Re: Colorless Wulfenite  

My first posting, ever, on any forum and I'm not clear on how to post pictures. What would be the coloring agent in Wulfenite?
Hi John.
Hi Mary-Ann.
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PostPosted: Jan 01, 2009 10:31    Post subject: Re: Colorless Wulfenite  

Hi Vic: Happy New Year. Welcome to the best mineral board. Going to Tucson? Maryanne
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PostPosted: Jan 01, 2009 11:28    Post subject: Re: Colorless Wulfenite  

Hey there Mary Ann,

Yes to Tucson. I'm site man for Granada Ave. Show, next to Danny T's. Can't wait to be in the center of the mineral collecting world again. I agree, best board, Thanks Jordi.
Vic
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PostPosted: Jan 01, 2009 12:18    Post subject: Re: Colorless Wulfenite  

Hi Vic, welcome here! To know more about how attach images, please use:
https://www.mineral-forum.com/message-board/viewtopic.php?t=20

and

https://www.mineral-forum.com/message-board/viewtopic.php?t=89

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PostPosted: Jan 01, 2009 15:01    Post subject: Re: Colorless Wulfenite  

Welcome Vic. So nice to have you aboard, I know you will enjoy this Forum and that you will have lots of good things to contribute to it. There seems to be a lot of interest in examples of mineral collecting in the field and I know you have done a lot of this in New England.

WRT your question, wulfenite comes in just about every color imaginable, and I doubt that anyone has really studied the causes of its colors very much. The variety eosite is an exception and it contains circa 1.28% vanadium in place of molybdenum and is bright red. The locality for this material is the Wheatley mine, Chester Co., Pennsylvania. The vibrant red color of Red Cloud mine, Arizona, wulfenites is alleged to be due to trace amounts of chromium (130 ppm) and there is an obscure reference in the Min. Record index (not found in the book itself) to black auriferous wulfenite from the Old Yuma mine in Arizona. Finally there are reported to be gray and black wulfenites from Bleiberg, Austria, where the color is due galena inclusions. So you see, Vic, the answer is not a simple one.

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PostPosted: Jan 02, 2009 09:07    Post subject: Re: Colorless Wulfenite  

Attached is a photo of dark brown wulfenite from the Globe Mine in Arizona. This is opaque and apparently the color is due to inclusions, perhaps of a manganese oxide. Some crystals have zones that are not totally opaque; here the color is grey to yellowish.


Wulfenite 6c.JPG
 Description:
Wulfenite, Glove Mine, Santa Cruz County, Arizona. Crystals are 1-2 mm.
 Viewed:  37205 Time(s)

Wulfenite 6c.JPG



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PostPosted: Jan 02, 2009 09:45    Post subject: Re: Colorless Wulfenite  

I have collected flats of stuff like this managnese-oxide included wulfenite at the Glove Mine and similar iron-oxide included wulfenite in the Defiance Mine. In both cases the pockets were zoned from almost unincluded clean crystals on the back of the pocket, and grading downward to the heavily included examples occuring on the floor and lower sides of the pocket. Some of the pieces occured in transition zones and along protrusions into the pocket where pieces showed a range of colors across 5-10 cm vertically.

John's comments about Chrome are well taken, there are a number of wulfenite occurrences here in central Arizona that are near ultramafic diabase dikes...these have high Cr and the wulfenites from these localities are typically a very strong red. Has anyone heard anything similar about the gorgeous red material from Iran?

Maybe we should change the name of this thread to Color in Wulfenite instead of colorless wulfenite.

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PostPosted: Jan 09, 2009 05:52    Post subject: Re: Colorless Wulfenite  

Through the wonders of the internet I have just heard back from Pierre Bariand and he wrote that the red color of the wulfenite from Iran is due to chomium. So, add another one to the chromium column. Thanks Pierre!
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