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Messaggeria in lingua italianaBisogno di aiuto per Arcu su Linnarbu / Need help for Arcu su Linnarbu

4th May 2021 06:41 UTCAlix Julien

Buongiorno a tutti,

Ho una domanda veloce per la comunità italiana che conosce bene Arcu su Linnarbu ( https://www.mindat.org/loc-2123.html ).
Ho un esemplare con una crosta de botroide nera come nelle sue foto:
E io non arrivo a sapere se è Goethite (che è descritto in località su mindat e accompagnato da questa singola foto: https://www.mindat.org/photo-1055518.html ) o se è Pitchblend / Pechblend (che non è descritto localmente su mindat).
Sono stupito che non ci sia Pitchblend / Pechblend in questa località. Sbaglio o ce n'è qualcuna ma non è stata descritta?
Ho guardato tutte le foto della località ma nessuno ne ha parlato nella descrizione (il che è un peccato).
Qualcuno ha idea dell'identificazione di questo minerale.

Grazie mille per l'aiuto.

Alix JULIEN

P.S.: Scusa se il mio italiano è pessimo. :s

                                          ---------------------------------------------------------------------------

Good morning all,

I have a little question for the Italian community knowing Arcu su Linnarbu well ( https://www.mindat.org/loc-2123.html ).
I have a specimen with a black, botryoidal crust as in his photos:
And I do not manage to know if it is Goethite (which is described in the locality on mindat and accompanied by this single photo: https://www.mindat.org/photo-1055518.html ) or if it 'is Pitchblend / Pechblend (which is not locally described on mindat).
I am amazed that there is no Pitchblend / Pechblend at this locality. Am I wrong or there is some but it has not been described?
I looked at all the photos of the locality but no one mentioned it in the description (which is a shame).
Does anyone have any idea of ​​the identification of this mineral.

Thank you for your help.

Alix JULIEN

4th May 2021 06:46 UTCHerwig Pelckmans

Alix,
uraninite is listed for that locality.
Cheers, Herwig

4th May 2021 07:09 UTCAlix Julien

Ah sì! Che idiota che sono!
Non sapevo che Pechblend / Pitchblend fosse una varietà di Uraninite. Grazie Herwig! :)
Ma ahimè, non ci sono immagini da confrontare. Quindi non sono ancora sicuro dell'identificazione :s

Grazie ancora!

Alix JULIEN

                                          ---------------------------------------------------------------------------

Ah yes! What an idiot that I am!
I didn't know that Pechblend / Pitchblend was a variety of Uraninite. Thanks Herwig! :)
But alas, there are no pictures to compare. So I am still not sure of the identification :s

Thanks again!

Alix JULIEN

4th May 2021 08:56 UTCAntonio Borrelli Expert

Most probably goethite. Uraninite at Arcu su Linnarbu is only found in small non-crystallized veinlets.

4th May 2021 16:36 UTCHerwig Pelckmans

Alix,
check the radiation. 
If uraninite the rock should be "hot" and make the Geiger counter go crazy !!
If goethite you might still have some radiation, but way less.
Compare with another specimen from the same locality to get an idea of the background noise.
Cheers, Herwig

7th May 2021 18:13 UTCGiorgio Bortolozzi

La goethite (mammellonare) è molto comune, così nessuno (tranne me) l'ha segnalata nelle fotografie.

8th May 2021 20:21 UTCAlix Julien


Buongiorno a tutti,

Grazie per l'aiuto.
Non ho un contatore Geiger e comunque ci sarà stato un segnale (credo) perché c'è Phosphuranylite sul Goethite.
Grazie Giorgio Bortolozzi per esserti sforzato di scriverlo e per averlo evidenziato nelle tue foto.

Grazie ancora per l'aiuto fornito ea presto.

Alix JULIEN

                                          ---------------------------------------------------------------------------

Hello all,

Thanks for your help.
I don't have a Geiger counter and in any case there will have been a signal (I think) because there is Phosphuranylite on the Goethite.
Thank you Giorgio Bortolozzi for making the effort to write it down and for pointing it out in your photos.

Thank you again for the help provided and see you very soon

Alix JULIEN
 
 
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