Moroccan Mineral to ID

Hello All
Can you please elp me identify this Moroccan Mineral? thank you
Malek

Sure looks like Selenite crystals on Dolomite from the new find at:
Bou Bekker
Touissit
Oujda-Angad Province, Oriental Region
Morocco

Gypsum over dolomite. The greenish inclusions have been labeled as malachite, brochantite, and a few other things. I don't know if anyone has reported an actual chemical analysis of the inclusions.



Edited 1 time(s). Last edit at 07/25/2012 12:30AM by Steve Hardinger.

i seen somewhere than the inclusion in morrocan gypsum roses are made of rosasite or aurichalcite .but im not really sure. im personnaly think than they are made of something like atacamite or conichalcite. i own some of this morrocan gypsum specimen on dolomite and i hope the question will be nail one day.bye



Edited 1 time(s). Last edit at 07/26/2012 09:13AM by Yanick Beaudet.

I saw this material at a recent show labelled Deviline!!! I asked how this had been determined and was told that French micromounters had identified it!!! With what tests? "Oh they know all about it" Elsewhere it was labeled rosasite in gypsum which is far more believable and backed up by XRD.

Many years ago, I was told it was Malachite covered by Gypsum, but a couple of years ago, Horst
Burkhart, a german mineral dealer specializing exclusively in Moroccan minerals and a Tucson regular at
the InnSuites, told me he had those specimens analyzed and it was indeed Devilline overlain by Gypsum.
It makes sense - a sulphate overlain by a sulphate. John S.

hi think at atacamite cause i own a specimen of gypsum needles coated and included by atacamite from Atacama desert Chile.the colour look like a part of the morrocan specimens but a part of the specimens have blue green colour looking more like a copper-zinc minerals like rosasite .maybe we can find more than one cuprian minerals as inclusions in morrocan gypsum from this localty. that can explain the numerous different label for this kind of stone .an expert from this part of the world can be helpy in this situation.remerber the numerous copper minerals we can find in quartz at a same mining site.for example papagoite, shattuckite, ajoite and celadonite in quartz for the same african location.bye

Definitively this is not atacamite. I analyzed (XRD) several of the and all them were rosasite. So probably all the are rosasite.
Yanick papagoite, shattuckite, ajoite are not known so far. If you have any analyzes I will be happy to take a look. They are known from South Africa.
Cheers!

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"Spirifer" Geological Society

sorry thomas i dont said than papagoite and ect are found in morroco .i only try to say than a same minerals can have different kind of inclusions like papagoite, ajoite, shattuckite, hematite,epidote ,epidote variety piemontite,native copper found in one quartz specimen from the south africa for example. i own a quartz point with all this inclusions in one south african specimen .it's why i think before than more than one kind of inclusions can be found in gypsum from this morrocan locality .but if you said than you analysed gypsum from this morrocan locality and all contains rosasite it's probably right and the difference of colors between two specimens from there was probably caused by a different intensity of colors of the included rosasite, that can make people think than he exist more than a possible inclusions in gypsum there.i happy than someone make a real analyse of this inclusions .i think i can now complete the label for my specimen. sorry for misunderstood caused by my bad english.bye

Yanick, there is always possibility that there is more than one mineral under gypsum, this is why I analyzed several (not just one) in different shades. In fact this are not inclusions but sprays which are covered by gypsum.
Cheers!
Tomek

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"Spirifer" Geological Society

yeah . i check on ebay and i seen none specimens with an other id than rosasite in gypsum.i think now than the specimen with an other label are old specimen collect before the first analyses or error made by the sellers. but on ebay too i seen a specimen supposed to be on blade like barite.the two kind of matrix really exist from there or it's a mistake about the id of the dolomite ?

Please attach some photos without it it is difficult to say something.

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"Spirifer" Geological Society

sorry i doht have this specimen it's only and old auction i already seen in the past . i want only know if you seen specimens of gypsum on barite in the ones you analysed. bye

I saw only on dolomite as far.

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"Spirifer" Geological Society

Hello!

I created separate topic on this problem (http://www.mindat.org/mesg-7-278255.html), because there is no reliable information on identity of above mentioned green crystals (rosasite or devilline?). I tried to do simple test on the specimen from my collection using HCl. Gypsum was dissolved with effervescence, but green crystals remained intact. So, they are not rosasite. I'm not sure about solubility of devilline in HCl, but it seems to me that it is insoluble. So, we probably have devilline in these samples.

Best regards,
Dmitry.