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The information provided within this Forum about localities is only given to allow reference to them. Any visit to any of the localities requires you to obtain full permission and relevant information prior to your visit. FMF is strictly against any illicit activities related to collecting minerals.
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| Search found 1138 matches |
| Author | Message |
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 Topic: Are there pyrite balls found in Verzino? |
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| Roger Warin Replies: 7 Views: 674 |
 Forum: 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 ... |
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| Topic: Are there pyrite balls found in Verzino? |
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| Roger Warin Replies: 7 Views: 674 |
Forum: 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 |
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| Roger Warin Replies: 3 Views: 686 |
Forum: 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 ... |
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| Topic: Libyan Desert Glass Structure |
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| Roger Warin Replies: 60 Views: 92460 |
Forum: 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 ... |
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| Topic: Some rare phosphates from the Democratic Republic of Congo and Zimbabwe |
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| Roger Warin Replies: 3 Views: 686 |
Forum: 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 ... |
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| Topic: Some rare phosphates from the Democratic Republic of Congo and Zimbabwe |
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| Roger Warin Replies: 3 Views: 686 |
Forum: 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 ... |
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| Topic: Gwindel Skutterudite? |
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| Roger Warin Replies: 3 Views: 582 |
Forum: 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 ... |
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| Topic: Sainte-Marie-aux-Mines 2025 |
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| Roger Warin Replies: 32 Views: 6092 |
Forum: 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 ... |
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| Topic: Sainte-Marie-aux-Mines 2025 |
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| Roger Warin Replies: 32 Views: 6092 |
Forum: 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 ... |
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| Topic: Preparing a list of light sensitive minerals - (14) |
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| Roger Warin Replies: 97 Views: 216639 |
Forum: 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! |
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| Topic: Quartz Twins |
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| Roger Warin Replies: 6 Views: 2654 |
Forum: 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 ... |
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| Topic: Help Identifiying: Moonstone? |
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| Roger Warin Replies: 4 Views: 2037 |
Forum: 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 |
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| Roger Warin Replies: 16 Views: 21439 |
Forum: 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 ... |
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| Topic: Favourite countries of origin? |
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| Roger Warin Replies: 31 Views: 76869 |
Forum: 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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| Topic: When can a fossil be also considered a mineral? |
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| Roger Warin Replies: 55 Views: 172236 |
Forum: The Ten Thousand Club Posted: Mar 26, 2025 08:30 Subject: Re: When can a fossil be also considered a mineral? |
| It's better with the photo. | |
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