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cobalt - lotharmeyerite or koritnigite ?

Posted by Account Closed  
Account Closed May 08, 2012 09:00AM
Hello !

All is in the title :). Thanks

Edited 1 time(s). Last edit at 05/08/2012 09:10AM by Frédéric Hède.
Ronald John Gyllenhammer May 08, 2012 01:50PM
Hi Frédéric,

Possibly Cobaltkoritnigite? Compare here:

Account Closed May 08, 2012 02:52PM
Yes it's exactly that !

But on other post someone siad to me than it's probably erythrite.... Please help me for this identification :).
Lefteris Rantos May 08, 2012 02:58PM

I noticed this thread after I started a different topic concerning your photographs! See

To me, this is certainly NOT Cobaltlotharmeyerite, and most probably Erythrite. It could also be some other white arsenate such as Picropharmacolite, tinged pink by Co impurity.

I also strongly doubt that it can be Cobaltkoritnigite. Also these two photos and are most probably Erythrites and not Cobaltkoritnigite. True Cobaltkoritnigite shows a different distinct purple-red colour and also different crystal shape, such as in these photos (all from Bou Azzer distr.):

On the other hand, the tiny indistinct reddish-brown micro-xls scattered on Quartz and the grey sulfide, that are visible in several of your photos (most clearly here ), are much more likely to be Cobaltlotharmeyerite.

Jolyon & Katya Ralph May 08, 2012 03:34PM
Can I also add this is a very good example of why it is a bad idea to add text data, such as mineral names, to your photograph images.

When corrected, these images can not be displayed in the main database.
Account Closed May 08, 2012 03:41PM
Text is not a problem for me.. Problem is base where my photo are fixed. On all other website i can change with an external link :). Text modification are easy with photoshop an less with jpeg photo.... I don't work with jpeg or png. In fact some other problem exist too with low quality of photo on mindat. Format is not my format and compression is often bad.

Ok for erythrite but change on your base error too :)

Thanks Lefteris :)

I make modification in next hours.

Edited 1 time(s). Last edit at 05/08/2012 03:53PM by Frédéric Hède.
Account Closed May 08, 2012 03:47PM
Picropharmacolite here

I prefer this solution because color are not ever the same pink not ?

and here the same problem : (i take erythrite like this photo....)

same problem

Edited 2 time(s). Last edit at 05/08/2012 03:51PM by Frédéric Hède.
Lefteris Rantos May 08, 2012 04:05PM
Concerning this photo, the Sainfeldite ID is probably correct for the central violet-coloured crystals (I don't think it's Cobaltkoritnigite).

Concerning the pink balls, they could be either Erythrite, or Co-bearing Picropharmacolite. I really can't tell here. Association with Sainfeldite implies Picropharmacolite, but of course could also be consistent with Erythrite.

Account Closed May 08, 2012 04:41PM
All modification have been done :). For me, it's important to learn. Thanks for all.
Uwe Kolitsch May 08, 2012 06:06PM
I agree with Lefteris. Will sent messages concerning the two mentioned photos.
Account Closed May 08, 2012 06:21PM

i have written to Ivan (who has sent this specimen to me)

His response : I open personately the geode, extracting 46 samples. I let 2 of them analyze and they both gave a high Mg enought to cosider them wendwilsonite.

=> Mg is enough to spell them wendwilsonite....

I correct now definitively... ;)


Edited 2 time(s). Last edit at 05/08/2012 07:11PM by Frédéric Hède.
Lefteris Rantos May 08, 2012 07:01PM
Excellent, this info is precious to add in the photo captions.

By the way, Frederic, these are beautiful photos!!

Account Closed May 08, 2012 07:15PM
Thanks Lefteris ;). And i hope to continue longtimes, it's a great hobby for my old days....
Uwe Kolitsch May 10, 2012 06:13PM
"I let 2 of them analyze and they both gave a high Mg enought to cosider them wendwilsonite."

If the analyses were done by SEM-EDS you have to watch out - Mg and As peaks show a very strong overlap!
Reiner Mielke May 13, 2012 10:11PM
I asked about this a long time ago but got no response so I will ask it again. I have a specimen with this directly on top of this Is it common to find two different forms of Erythrite together like this or are the balls something else?
Uwe Kolitsch May 14, 2012 05:48PM
It's not common, but I have seen such two generations of erythrite.
Lefteris Rantos May 15, 2012 06:51PM
I also have one such piece. I have always assumed that both are Erythrite - just of two different generations.
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