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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 1129 matches |
| Author | Message |
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 Topic: Preparing a list of light sensitive minerals - (14) |
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| Roger Warin Replies: 97 Views: 214600 |
 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: 1990 |
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: 1735 |
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: 20766 |
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: 76024 |
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: 170778 |
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. | |
| Topic: When can a fossil be also considered a mineral? |
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| Roger Warin Replies: 55 Views: 170778 |
Forum: The Ten Thousand Club Posted: Mar 25, 2025 10:49 Subject: Re: When can a fossil be also considered a mineral? |
| Marco, Herwig,
Herwig is a legalist. I prefer the laws of nature. The opal is not a mineral species... “strictu sensu”. However, this was not the opinion of the IMA. Occult influences guided the IMA ... |
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| Topic: Libyan Desert Glass Structure |
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| Roger Warin Replies: 45 Views: 88665 |
Forum: Minerals and Mineralogy Posted: Mar 20, 2025 02:21 Subject: Re: Libyan Desert Glass Structure |
| Hello Marco,
Thank you for asking me this question. A tektite is of terrestrial origin. Libyan glass is of terrestrial origin. The difference is the impactor. There are several types of asteroids: ... |
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| Topic: #MVM (Minerals - Virtual Museum) Collection |
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| Roger Warin Replies: 87 Views: 24432 |
Forum: Collection photos and Collector's page Posted: Mar 19, 2025 00:43 Subject: Re: #MVM (Minerals - Virtual Museum) Collection |
| Hello Jordi,
Do we know about the color centers? We are in the REE region. Do these pretty hues tire in the light? Thank you. |
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| Topic: Libyan Desert Glass Structure |
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| Roger Warin Replies: 45 Views: 88665 |
Forum: Minerals and Mineralogy Posted: Mar 18, 2025 09:40 Subject: Re: Libyan Desert Glass Structure |
| Dear Herwig,
I was not familiar with this article, but all my previous readings came from scientists specializing in geophysics and astrophysics, but never in chemistry (or geochemistry). All these ... |
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| Topic: Libyan Desert Glass Structure |
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| Roger Warin Replies: 45 Views: 88665 |
Forum: Minerals and Mineralogy Posted: Mar 18, 2025 04:18 Subject: Artificial Intelligence and Libyan Desert Glass, tektites |
| Hello,
Some topics that interest us will always raise the same questions. For example, the Libyan Glass (LDG) is not a tektite at all, because its origin is totally different from a tektite. Its ver ... |
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| Topic: Libyan Desert Glass Structure |
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| Roger Warin Replies: 45 Views: 88665 |
Forum: Minerals and Mineralogy Posted: Mar 17, 2025 03:46 Subject: Re: Libyan Desert Glass Structure |
| Hello Marco,
Today, I am going to shock you: quartz is a mineral species that almost never exists as such. This was already the despair of “des Cloizeau” (famous French mineralogist (1817-1897) honor ... |
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| Topic: Poor mans macro mineral photography setup |
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| Roger Warin Replies: 2 Views: 1749 |
Forum: Micros & Macros - Images of Minerals Posted: Mar 04, 2025 09:51 Subject: Re: Poor mans macro mineral photography setup |
| Hello,
It's much easier than you think! I became a chemist because when I was 12, around 1946 or 1947, I was developing black and white photos without understanding. My camera was an old Kodak box. ... |
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| Topic: A true morphological twin of quartz according to the Dauphiné law. |
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| Roger Warin Replies: 5 Views: 3097 |
Forum: What is it? - Where is it from? Posted: Mar 02, 2025 15:18 Subject: A true morphological twin of quartz according to the Dauphiné law. |
| Hello,
I acquired this beautiful Brazilian smoky quartz crystal in Germany 40 years ago (!). I don't know where it came from. Can you help me? It is translucent and obviously belongs in a display c ... |
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| Topic: Sulfosalts |
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| Roger Warin Replies: 1 Views: 1638 |
Forum: Micros & Macros - Images of Minerals Posted: Feb 23, 2025 09:44 Subject: Sulfosalts |
| Hello,
I would like to show you a very rare mineral from my collection: dufrenoysite. Its globular habit is even rarer. In addition, it has a twin on (001) Dufrenoysite is a mineral species consist ... |
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