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Identity Helpcobalt - lotharmeyerite or koritnigite ?

8th May 2012 10:00 UTCAccount Closed

Hello !

All is in the title :). Thanks

http://www.alpinismeetmineraux.fr/mineralogie/macro/supermacro/supermacro731.jpg

8th May 2012 14:50 UTCRonald John Gyllenhammer Expert

Hi Frédéric,

Possibly Cobaltkoritnigite? Compare here: http://www.mindat.org/photo-283202.html

Ron

8th May 2012 15:52 UTCAccount Closed

Yes it's exactly that !

But on other post someone siad to me than it's probably erythrite.... Please help me for this identification :).

8th May 2012 15:58 UTCLefteris Rantos Expert

Frederic,

I noticed this thread after I started a different topic concerning your photographs! See http://www.mindat.org/mesg-106-260204.html

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 http://www.mindat.org/photo-283202.html and http://www.mindat.org/photo-229145.html 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.): http://www.mindat.org/photo-418291.html http://www.mindat.org/photo-418292.html http://www.mindat.org/photo-424251.html http://www.mindat.org/photo-424250.html

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 http://www.mindat.org/photo-463931.html ), are much more likely to be Cobaltlotharmeyerite.

Lefteris.

8th May 2012 16:34 UTCJolyon Ralph Founder

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.

8th May 2012 16:41 UTCAccount Closed

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.

8th May 2012 16:47 UTCAccount Closed

Picropharmacolite here http://www.mindat.org/photo-333530.html

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

8th May 2012 17:05 UTCLefteris Rantos Expert

http://www.mindat.org/photo-333539.html

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.

Lefteris.

8th May 2012 17:41 UTCAccount Closed

All modification have been done :). For me, it's important to learn. Thanks for all.

8th May 2012 19:06 UTCUwe Kolitsch Manager

I agree with Lefteris. Will sent messages concerning the two mentioned photos.

8th May 2012 19:21 UTCAccount Closed

hello,

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... ;)

Fred

8th May 2012 20:01 UTCLefteris Rantos Expert

Excellent, this info is precious to add in the photo captions.

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

Lefteris.

8th May 2012 20:15 UTCAccount Closed

Thanks Lefteris ;). And i hope to continue longtimes, it's a great hobby for my old days....

10th May 2012 19:13 UTCUwe Kolitsch Manager

"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!

13th May 2012 23:11 UTCReiner Mielke Expert

I asked about this a long time ago but got no response so I will ask it again. I have a specimen with this http://www.mindat.org/photo-283202.html directly on top of this http://www.mindat.org/photo-177199.html Is it common to find two different forms of Erythrite together like this or are the balls something else?

14th May 2012 18:48 UTCUwe Kolitsch Manager

It's not common, but I have seen such two generations of erythrite.

15th May 2012 19:51 UTCLefteris Rantos Expert

I also have one such piece. I have always assumed that both are Erythrite - just of two different generations.

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