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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 765 matches |
| Author | Message |
|---|---|
 Topic: Libyan Desert Glass Structure |
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| alfredo Replies: 7 Views: 446 |
 Forum: Minerals and Mineralogy Posted: Jan 11, 2025 19:45 Subject: Re: Libyan Desert Glass Structure |
| https://theconversation.com/how-we-solved-the-mystery-of-libyan-desert-glass-117253
https://uvadoc.uva.es/bitstream/handle/10324/35254/Multispectroscopic-methodology-Libian-desert.pdf?sequence=4 ... |
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| Topic: Carbonado |
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| alfredo Replies: 23 Views: 1684 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Jan 07, 2025 10:11 Subject: Re: Carbonado |
| Keep in mind though that diamond has a very high heat transmission ability, so that reduces its sensitivity to rapid temperature change. | |
| Topic: Carbonado |
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| alfredo Replies: 23 Views: 1684 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Jan 06, 2025 12:34 Subject: Re: Carbonado |
| Regular diamonds are rare, but carbonados are even more rare, being found almost exclusively in Brazil and the Central African Republic.
Most of the time, when people think they've found any sort o ... |
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| Topic: Contribution Dr. Menor-Salván - The spectacular borates of Shijiangshan, Mongolia - (54) |
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| alfredo Replies: 3 Views: 557 |
Forum: Featured Columns of FMF Posted: Dec 29, 2024 12:10 Subject: Re: Contribution Dr. Menor-Salván - The spectacular borates of Shijiangshan, Mongolia - (5 |
| It's amazing how similar these associations are to the Fuka mine in Japan, although the Chinese crystals have grown much bigger. | |
| Topic: Tektite ? |
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| alfredo Replies: 5 Views: 879 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Dec 10, 2024 07:44 Subject: Re: Tektite ? |
| The appearance clearly shows that this is chalcedony. Depending on how picky you want to be, it may or may not have enough banding to also be called "agate", but chalcedony for sure, not a t ... | |
| Topic: Can't read / decode this label to identify the fluorite location... |
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| alfredo Replies: 12 Views: 2118 |
Forum: What is it? - Where is it from? Posted: Nov 26, 2024 13:58 Subject: Re: Can't read / decode this label to identify the fluorite location... |
| Thank you, Tobi!
We need to think of a good punishment for people with terrible handwriting. My primary school teacher would never have accepted such a mess ;(( |
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| Topic: Can't read / decode this label to identify the fluorite location... |
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| alfredo Replies: 12 Views: 2118 |
Forum: What is it? - Where is it from? Posted: Nov 26, 2024 12:27 Subject: Re: Can't read / decode this label to identify the fluorite location... |
| I wonder whether the locality is simply the Grube Anna (Germany) and the last two lines are the person it was obtained from, ie. Paul somebody-or-other in Switzerland?
(with no implication that the m ... |
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| Topic: What is it??? |
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| alfredo Replies: 4 Views: 817 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Nov 18, 2024 15:12 Subject: Re: What is it??? |
| Ruben, Was your grandpa from Spain? If so, I suspect that piece comes from Los Serranos quarry in Alicante: https://www.mindat.org/loc-3101.html | |
| Topic: Is this a gold ore??? |
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| alfredo Replies: 14 Views: 2725 |
Forum: What is it? - Where is it from? Posted: Oct 28, 2024 02:35 Subject: Re: Is this a gold ore??? |
| The magnetism of such a tiny amount of biotite would not be noticeable. | |
| Topic: Galena from Hiendelaencina |
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| alfredo Replies: 8 Views: 2270 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Oct 02, 2024 13:14 Subject: Re: Galena from Hiendelaencina |
| https://www.mindat.org/gallery.php?loc=3122&min=1641
There are only a couple of Hiendalaencina galenas pictured on Mindat (and none on Mineralienatlas), and they don't look anything like the on ... |
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| Topic: Colors of minerals |
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| alfredo Replies: 7 Views: 2393 |
Forum: Minerals and Mineralogy Posted: Sep 17, 2024 10:06 Subject: Re: Colors of minerals |
| There are cultural differences in color perception too. The Japanese call a lot of shades "blue" which we would call "green" in the Anglo world. Even traffic lights are called red ... | |
| Topic: What is it? |
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| alfredo Replies: 2 Views: 1425 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Jul 28, 2024 10:50 Subject: Re: What is it? |
| Siderite? | |
| Topic: Is Malachite Rare? |
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| alfredo Replies: 3 Views: 2104 |
Forum: Minerals and Mineralogy Posted: Jun 20, 2024 15:07 Subject: Re: Is Malachite Rare? |
| Malachite is one of the most common minerals, but if we limit the discussion to lapidary grade malachite, that is much less common. Used to come from Russia (deposits exhausted?), and currently from t ... | |
| Topic: Is it possible for this specimen of Hyalite to be associated with other minerals? |
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| alfredo Replies: 8 Views: 2347 |
Forum: Minerals and Mineralogy Posted: Jun 01, 2024 20:02 Subject: Re: Is it possible for this specimen of Hyalite to be associated with other minerals? |
| If you are cutting minerals, you should protect your health with very good dust control. Dust getting into your lungs is bad, and not just radioactive mineral dust, ANY kind of dust. Even common stuff ... | |
| Topic: Is it possible for this specimen of Hyalite to be associated with other minerals? |
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| alfredo Replies: 8 Views: 2347 |
Forum: Minerals and Mineralogy Posted: May 31, 2024 08:49 Subject: Re: Is it possible for this specimen of Hyalite to be associated with other minerals? |
| The green fluorescence of hyalite opal is caused by extremely tiny quantities of uranyl ions, not enough to create any harmful level of radioactivity. Usually no discrete particles of any secondary ur ... | |
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