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PhotosBerthierine - Pralongo granite quarry, Pralongo, Vanoi Valley, Canal San Bovo, Trento Province, Trentino-Alto Adige, Italy

16th May 2019 16:53 UTCKevin Hean

Berthierine

Pralongo granite quarry (Pralongo Quarry; Grisotto Quarry), Pralongo, Vanoi Valley, Canal San Bovo, Trento Province (Trentino), Trentino-Alto Adige (Trentino-South Tyrol), Italy

Don't ask me why ? But for some reason I really like this photo.

16th May 2019 17:25 UTCLászló Horváth Manager

Are you sure this is berthierine rather than berthierite?

16th May 2019 18:00 UTCAlfredo Petrov Manager

Berthierite forms metallic needles, doesn't it? This photo does indeed look much more like berthierine.

16th May 2019 19:28 UTCFrank K. Mazdab 🌟 Manager

Perhaps a note should be added to both mineral pages noting the name similarities, "not to be confused with _________".

And to the spirit of whoever named the second one or let the second one stand after the first one was accepted as a name, my god man, what were you thinking?

But it is a rather compelling photo, particularly for a sheet silicate.

16th May 2019 20:04 UTCErik Vercammen Expert

When I saw the picture first, my idea was "iron rose"!

16th May 2019 22:28 UTCKrzysztof Andrzejewski

Erik Vercammen Wrote:

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> When I saw the picture first, my idea was "iron rose"!

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- I'm still thinking of hematite :)

here one more photo:

https://www.mindat.org/photo-831619.html

16th May 2019 22:36 UTCHarjo Neutkens Manager

Greenish translucent hematite?? No way, in my opinion...

I wouldn't visually ID it as berthierine neither. I'll ask the uploader for analysis results. I won't be surprised if it turns out to be chamosite.

16th May 2019 22:48 UTCKrzysztof Andrzejewski

Harjo Neutkens Wrote:

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> Greenish translucent hematite?? No way, in my opinion...

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- it was just a joke :)

17th May 2019 00:01 UTCRichard Gunter Expert

Berthierine could be green (it is theoretically Fe dominant) but the analyzed bertherines from Kidd Creek and Mont Saint Hilaire are much lighter in colour and do not look so "chlorite-like". It is unfortunate that two totally unrelated phases have almost the same name; this is where we need the IMA to look at a dissimilar name for one of them. As berthierite was described in 1827 and berthierine was described prior to 1832 this situation has been around a long time.

17th May 2019 09:13 UTCAntonio Borrelli Expert

The identical photo is present in the article describing the certain finding of this species but in the caption it is described as possible berthierine or another chlorite group mineral. Also similar chamosite can be found at this locality.

Ref. = Venzo, Z., Bittarello, E., Canal, A., Ciriotti, M.E., Gasparetto, P., Pegoraro, S., Toffolo, L., Tosato, F. (2017): La Cava di granito "Grisotto" in località Pralongo, Valle del Vanoi, Canal San Bovo. Trento. Micro, 15, 1-2017, 44-62.

17th May 2019 21:56 UTCHarjo Neutkens Manager

I received this from Paolo Gasparotto, so that settles the case ;-)

Dear Harjo,

Thank you for your report, the species under discussion was analyzed by the Ami-Siuk service at the Department of Earth Sciences of the University of the Studies of Turin. The identification of the samples included spectroscopy EDS, microRaman spectroscopy, X-ray diffraction on powders and on crystal single. Micro Raman analyzes have been made at the "Interdepartmental Center G. Scansetti for the study of asbestos and of other harmful particulates "from Turin. The investigations diffractometers have been carried out at the CrisDi (Interdepartmental Center for the development of Diffractometric Crystallography) of Turin.

The article "THE GRANITE QUARRY" GRISOTTO "

IN PRALONGO, VALLE DEL

VANOI, CANAL SAN BOVO, TRENTO

by Zaira Venzo, Erica Bittarello, Andrea Canal,

Marco E. Ciriotti, Paolo Gasparetto, Sergio Pegoraro,

Luca Toffolo, Fabio Tosato.

Published in "Micro" vol. 15, 2017

18th May 2019 08:24 UTCRalph S Bottrill 🌟 Manager

Thanks Harjo, it’s remarkable for what is usually a clay mineral.

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