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PhotosOrpiment - Lucéram, Alpes-Maritimes, Provence-Alpes-Côte d'Azur, France
27th Jul 2012 08:28 UTCPascal Chollet Expert
The right locality might not be Luceram, but Duranus.
Both sites are about 7km (straight line) from each other, and the contexts are very similar.
Orpiment is widely dominant in luceram, realgar remains very rare, and only can be found in very thin crystallizations.
In Duranus, realgar is dominant, showing centimetric crystals, although nice orpiment radiated groups can be found.
Compare the sample I self collected recently
http://www.mindat.org/photo-478578.html
http://www.mindat.org/photo-478577.html
Pascal
31st Jul 2012 17:04 UTCUwe Kolitsch Manager
12th Aug 2012 01:40 UTCPeter Haas
14th Aug 2012 22:22 UTCPascal Chollet Expert
I asked Jean Feraud, who did his doctorate these studying Luceram & Duranus metallogeny. (FERAUD J. (1974) : Les gisements de sulfures d'arsenic du sud-est de la France. Minéralisations liées aux strates et gîtes filoniens. Thèse doctorat spec. géologie appliquée, option gisements minéraux. Université de Paris IV)
(I'll add this reference in the localities datas)
He answered : "Tu as probablement raison, le facies est typique de Duranus, avec le calcaire argileux (marl) en hosting rock. Le peu d'orpi que j'ai vu dans les marnocalcaires de Luceram n'etait pas en gerbes de 2 cm ou plus comme celui de Chervet, mais en paillettes de qq mm dans des filets de calcite de un a trois mm de puissance (bien sur des masses plus grosses sont dans la glauconitite silicifiee grise ou verte)"
Translation :
You might probably be right. the habit is typical from Duranus, with clay-limestone (marl) hosting rock. The few orpiment I've seen in Luceram marl weren't in 2cm large (or more) sprays as this one from Chervet, but in small flakes, a few mm large only, included in small veins of calcite about 1 to 3 mm large.
(in Luceram) Larger masses of orpiment can be found in grey to greenish silicated glauconitite .
Pascal
14th Aug 2012 22:48 UTCryan christensen
14th Aug 2012 23:05 UTCPascal Chollet Expert
"N.B. : This piece is not self-collected, and the labelled locality "Luceram" remains doubtful to me, as I've never seen this habit in the site before"
I'm quite certain it's not Luceram. I'll soon do a photo of the hosting rock, if you can help determine the exact locality.
There's a bug here too : photos appears twice. they are parent and child images and the are duplicated (photo numbers are the same ones)
Regards
14th Aug 2012 23:07 UTCPeter Haas
Merci. Je vais changer la localité.
Ryan,
Have you read the first post ? Perhaps, I should ask you why you didn't ...
The specimens in question were collected by Pascal himself.
14th Aug 2012 23:12 UTCryan christensen
14th Aug 2012 23:19 UTCRob Woodside 🌟 Manager
14th Aug 2012 23:22 UTCryan christensen
"N.B. : "This piece is not self-collected", and the labelled locality "Luceram" remains doubtful to me, as I've never seen this habit in the site before"
But my picture records will tell.
14th Aug 2012 23:32 UTCryan christensen
14th Aug 2012 23:34 UTCDon Saathoff Expert
Don
14th Aug 2012 23:36 UTCDon Saathoff Expert
Don
15th Aug 2012 06:37 UTCPascal Chollet Expert
http://www.mindat.org/photo-345100.html
http://www.mindat.org/photo-345103.html
(the third one is self collected)
The samples from Duranus are self collected too, there are no doubt with the locality.
Thanks Peter (there might have been a mix with the labels of the Chervet Collection some time before...)
Pascal
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