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Newest topics and users posts
16 Jul-12:44:28 Architectural spinel from vietnam / #mvm (minerals - virtual museum) collection (Jordi Fabre)
16 Jul-12:18:23 New book: minerals of britain and ireland 2009-2024 - a review (Jordi Fabre)
16 Jul-09:38:43 Re: collection of michael shaw (Michael Shaw)
15 Jul-13:05:10 Sphalerite with calcite from Áliva, spain / #mvm (minerals - virtual museum) collection (Jordi Fabre)
15 Jul-11:32:34 Goesdorf mine (luxembourg) antimony (Roger Warin)
14 Jul-18:03:59 Malachite after azurite on goethite (Silvia)
14 Jul-16:43:05 The mizunaka collection - quartz (Am Mizunaka)
14 Jul-09:34:45 Re: collection of michael shaw (Michael Shaw)
13 Jul-12:19:45 Lazurite (lapis lazuli) from afghanistan / #mvm (minerals - virtual museum) collection (Jordi Fabre)
12 Jul-23:04:14 Re: collection of volkmar stingl (Volkmar Stingl)
12 Jul-09:00:56 Re: the mim museum in beirut, lebanon (Mim Museum)
12 Jul-06:59:21 Re: collection from dany mabillard (Dany Mabillard)
12 Jul-00:49:24 Re: are there pyrite balls found in verzino? (Herwig)
12 Jul-00:25:14 Re: are there pyrite balls found in verzino? (Roger Warin)
12 Jul-00:08:38 Re: are there pyrite balls found in verzino? (Roger Warin)
11 Jul-17:36:07 The mizunaka collection - fluorite (Am Mizunaka)
11 Jul-14:14:25 Re: slice schalenblende (Mathias)
11 Jul-14:08:21 Re: czech rockhounding adventures – agates & amethysts (Stoner)
11 Jul-08:12:55 Czech rockhounding adventures – agates & amethysts (Stoner)
11 Jul-08:03:52 Re: are there pyrite balls found in verzino? (James Catmur)
11 Jul-02:33:28 Re: collection of michael shaw (Michael Shaw)
11 Jul-00:24:28 Re: collection of volkmar stingl (Volkmar Stingl)
10 Jul-13:46:07 Re: are there pyrite balls found in verzino? (Dany Mabillard)
10 Jul-13:45:53 Veszelyite from sanguozhuang, china / #mvm (minerals - virtual museum) collection (Jordi Fabre)
09 Jul-15:45:27 Re: caldbeck fell trip (Roy Starkey)

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  Topic: Goesdorf mine (Luxembourg) Antimony
Roger Warin

Replies: 0
Views: 113

PostForum: Mines and Mineral Localities   Posted: Jul 15, 2025 11:32   Subject: Goesdorf mine (Luxembourg) Antimony
GOESDORF (L) – its historic antimony mine.

Already known in Roman times (the site is not far from Trier in Germany), the antimony deposit at Goesdorf is one of the oldest mines in the Grand Duchy o ...
  Topic: Are there pyrite balls found in Verzino?
Roger Warin

Replies: 7
Views: 1664

PostForum: Incorrect classification and fakes   Posted: Jul 12, 2025 00:25   Subject: Re: Are there pyrite balls found in Verzino?
Curiously, while many of these spheres (Cap Blan Nez) are susceptible to alteration over time, some remain stable under identical storage conditions.
It seems to me that the balls that decompose unde ...
  Topic: Are there pyrite balls found in Verzino?
Roger Warin

Replies: 7
Views: 1664

PostForum: Incorrect classification and fakes   Posted: Jul 12, 2025 00:08   Subject: Re: Are there pyrite balls found in Verzino?
I believe that Belgian scientists (Flanders) established long ago that the marcasite balls found at Cap Blanc Nez (France) and the surrounding area are in fact often pyrite.
  Topic: Some rare phosphates from the Democratic Republic of Congo and Zimbabwe
Roger Warin

Replies: 3
Views: 1353

PostForum: Minerals and Mineralogy   Posted: Jul 03, 2025 13:28   Subject: Re: Some rare phosphates from the Democratic Republic of Congo and Zimbabwe
All neutral phosphates are insoluble, except those whose cation is alkaline.
However, copper phosphates are not widely found in the DRC, even though copper is abundant there. I have selected two spec ...
  Topic: Libyan Desert Glass Structure
Roger Warin

Replies: 60
Views: 95175

PostForum: Minerals and Mineralogy   Posted: Jul 01, 2025 05:05   Subject: Re: Libyan Desert Glass Structure
Excuse me, but I think our worlds are parallel.
Where could this radioactivity be coming from?
What's more, beta radiation has moderate penetrating power.
I can see two possibilities for creating g ...
  Topic: Some rare phosphates from the Democratic Republic of Congo and Zimbabwe
Roger Warin

Replies: 3
Views: 1353

PostForum: Minerals and Mineralogy   Posted: Jun 30, 2025 21:33   Subject: Re: Some rare phosphates from the Democratic Republic of Congo and Zimbabwe
Thank you Knut,
I had forgotten that, because I knew it in 2012 when I described hopéite to illustrate the Agab-Minibul monthly magazine, Liege.
Zambia, formerly known as Northern Rhodesia, and Zimb ...
  Topic: Some rare phosphates from the Democratic Republic of Congo and Zimbabwe
Roger Warin

Replies: 3
Views: 1353

PostForum: Minerals and Mineralogy   Posted: Jun 29, 2025 16:43   Subject: Some rare phosphates from the Democratic Republic of Congo and Zimbabwe
Hello,
Following a lecture on phosphates from the Democratic Republic of Congo (Katanga) at our AGAB-Liege club, I rummaged through my drawers looking for cornétite and other phosphates.
I found two ...
  Topic: Gwindel Skutterudite?
Roger Warin

Replies: 3
Views: 1233

PostForum: Minerals and Mineralogy   Posted: Jun 29, 2025 00:14   Subject: Re: Gwindel Skutterudite?
Hello Marco,
I won't mention a possibility similar to the formation of twisted quartz, because only quartz, with its unique tectosilicate structure, can cause such deviations. I think Pete is much mo ...
  Topic: Sainte-Marie-aux-Mines 2025
Roger Warin

Replies: 32
Views: 8251

PostForum: News about Shows   Posted: Jun 25, 2025 06:54   Subject: Re: Sainte-Marie-aux-Mines 2025 - We need help!
Hello Jordi,
I share your disappointment. I myself can no longer go to SMM in a mountainous country (!) that is difficult to access when mobility is reduced by age.
In Munich, it's different. Access ...
  Topic: Sainte-Marie-aux-Mines 2025
Roger Warin

Replies: 32
Views: 8251

PostForum: News about Shows   Posted: Jun 22, 2025 23:16   Subject: Re: Sainte-Marie-aux-Mines 2025 - We need help!
Hello,
In the official customs note, I didn't see any hint of tolerance. I get the impression that Gaelle Skocibussic is reassuring non-professional exhibitors, probably rightly so.
I still have dou ...
  Topic: Preparing a list of light sensitive minerals - (14)
Roger Warin

Replies: 97
Views: 218515

PostForum: Featured Columns of FMF   Posted: May 22, 2025 04:09   Subject: Re: Preparing a list of light sensitive minerals - (14)
Thanks, Alfredo,
You're right, all that crystallization water can never go back into the crystal lattice.
9 H2O!
  Topic: Quartz Twins
Roger Warin

Replies: 6
Views: 3464

PostForum: Minerals and Mineralogy   Posted: May 07, 2025 15:10   Subject: Re: Quartz Twins
Indeed, Bob, Pete, what a wonderful lesson!
As I have two specimens of Japan twin, habit from La Gardette, I am trying to write a general article. I think I am being presumptuous, please forgive me a ...
  Topic: Help Identifiying: Moonstone?
Roger Warin

Replies: 4
Views: 2472

PostForum: What is it? - Where is it from?   Posted: Apr 15, 2025 08:08   Subject: Re: Help Identifiying: Moonstone?
If it were a moonstone (collected by gemologists), it would be a rock made of a mixture of orthoclase and albite. At this point, it is enough to check whether this sample has cleavage. The optical phe ...
  Topic: cristobalite vs chalcedony in thin section
Roger Warin

Replies: 16
Views: 22300

PostForum: Minerals and Mineralogy   Posted: Apr 08, 2025 09:14   Subject: Re: cristobalite vs chalcedony in thin section
As I observed in LDG, cristobalite microcrystals readily aggregate into micro-ourses that occupy an intercalated phase (spherules) in another phase, as in semi-crystalline polymers.
I insist to my fr ...
  Topic: Favourite countries of origin?
Roger Warin

Replies: 31
Views: 77752

PostForum: Favourite Minerals   Posted: Apr 07, 2025 06:53   Subject: Re: Favourite countries of origin?
When you have decades of collections, interest in a region changes over time. This is because mineralogy is a function of the economic or geopolitical activity of the moment.
When I was young, the Co ...
 
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