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A general guide for using the Forum with some rules and tips
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 1146 matches |
| Author | Message |
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 Topic: Quartz Japan Twin |
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| Roger Warin Replies: 9 Views: 2604 |
 Forum: Minerals and Mineralogy Posted: Aug 19, 2025 13:55 Subject: Re: Quartz Japan Twin |
| Hello, you mention the Griesenthal twin. What is the law governing this twin?
I would like you to explain what this unlikely twin is. I don't know what it looks like. What are the references? I sti ... |
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| Topic: The most over-rated/overpriced species??? |
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| Roger Warin Replies: 7 Views: 2361 |
Forum: Minerals and Mineralogy Posted: Aug 11, 2025 12:01 Subject: Re: The most over-rated/overpriced species??? |
| Hello,
When I was a little younger, in the early 1990s, the prices of minerals from RSA and Tsumeb were affordable. In 1992, ajoite was rather despised compared to papagoite, which had a more attract ... |
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| Topic: #MVM (Minerals - Virtual Museum) Collection |
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| Roger Warin Replies: 124 Views: 44426 |
Forum: Collection photos and Collector's page Posted: Aug 05, 2025 01:22 Subject: Re: #MVM (Minerals - Virtual Museum) Collection |
| Oh yes, on the joaquinite crystal! | |
| Topic: #MVM (Minerals - Virtual Museum) Collection |
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| Roger Warin Replies: 124 Views: 44426 |
Forum: Collection photos and Collector's page Posted: Aug 04, 2025 22:16 Subject: Re: #MVM (Minerals - Virtual Museum) Collection |
| Hello, excellent as always, but not fully awake, I didn't spot the little 'benitoite'. | |
| Topic: Identification of 2 minerals under microscope |
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| Roger Warin Replies: 13 Views: 1570 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Jul 28, 2025 09:31 Subject: Re: Identification of 2 minerals under microscope |
| Hello,
Did you cut these thin sections yourself? I think the thickness exceeds 30 µm. For the first two photos, I would have thought of pyroxenes, twinned. A crystal is sectioned along the base an ... |
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| Topic: About nomenclature |
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| Roger Warin Replies: 0 Views: 1075 |
Forum: Minerals and Mineralogy Posted: Jul 27, 2025 05:03 Subject: About nomenclature |
| The IMA reigns supreme in this reserved domain. There has been so much abuse that a watchdog was needed. This problem is, of course, limited to professionals. That much is obvious.
But professionals ... |
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| Topic: #MVM (Minerals - Virtual Museum) Collection |
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| Roger Warin Replies: 124 Views: 44426 |
Forum: Collection photos and Collector's page Posted: Jul 25, 2025 14:31 Subject: Re: #MVM (Minerals - Virtual Museum) Collection |
| Until now, I thought that the large size of the cesium cation was responsible for the low elongation of morganite. It develops more laterally than along the c axis.
Pezzotaite confirms this fact. Ho ... |
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| Topic: Goesdorf mine (Luxembourg) Antimony |
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| Roger Warin Replies: 0 Views: 1289 |
Forum: 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 ... |
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| Topic: Are there pyrite balls found in Verzino? |
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| Roger Warin Replies: 9 Views: 3172 |
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: 9 Views: 3172 |
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: 2067 |
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: 71 Views: 101222 |
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: 2067 |
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: 2067 |
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: 1796 |
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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