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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 752 matches |
| Author | Message |
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 Topic: Is it possible for this specimen of Hyalite to be associated with other minerals? |
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| alfredo Replies: 8 Views: 503 |
 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: 503 |
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 ... | |
| Topic: 2 Unknowns co-occurring with Caledonite, Grand Reef Mine, AZ |
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| alfredo Replies: 4 Views: 1572 |
Forum: What is it? - Where is it from? Posted: Mar 27, 2024 15:18 Subject: Re: 2 Unknowns co-occurring with Caledonite, Grand Reef Mine, AZ |
| You might want to ask Bill Besse in Tucson. He wrote his thesis on that mine. | |
| Topic: Green seam. Looks like it in a state of decay. |
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| alfredo Replies: 6 Views: 1723 |
Forum: What is it? - Where is it from? Posted: Mar 19, 2024 10:06 Subject: Re: Green seam. Looks like it in a state of decay. |
| More likely epidote, which is not uncommon as veins and fracture coatings in altered granites. | |
| Topic: Are there any big mineral shows in canada? |
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| alfredo Replies: 5 Views: 1961 |
Forum: Mineral Shows Posted: Mar 10, 2024 09:38 Subject: Re: Are there any big mineral shows in canada? |
| As Peter said, Bancroft seems to be the biggest and most well known Canadian show. There is usually a small handful of international visitors from the USA or Europe, but in general it's pretty much ju ... | |
| Topic: besoin d'aide sur cette pierre (pierre qui allume une ampoule) |
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| alfredo Replies: 8 Views: 2365 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Mar 03, 2024 08:21 Subject: Re: besoin d'aide sur cette pierre (pierre qui allume une ampoule) |
| Si vous voulez convaincre les gens que vous avez trouvé une pierre magique, vous devrez vous rendre sur un forum Internet peuplé de personnes plus crédules. Sur ce forum FMF, il est peu probable que v ... | |
| Topic: besoin d'aide sur cette pierre (pierre qui allume une ampoule) |
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| alfredo Replies: 8 Views: 2365 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Mar 03, 2024 05:30 Subject: Re: besoin d'aide sur cette pierre (pierre qui allume une ampoule) |
| Je pense que c'est juste une fausse astuce, pas réaliste. | |
| Topic: Can anyone tell me if this is Stellar Beam Calciite? |
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| alfredo Replies: 8 Views: 2144 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Feb 14, 2024 18:23 Subject: Re: Can anyone tell me if this is Stellar Beam Calciite? |
| Well, the "calcite" part looks correct, so no, I don't think this is an imitation, it's a real natural calcite, a mineral that is abundant enough that there's no need to fake it.
The &quo ... |
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| Topic: Preparing a list of light sensitive minerals - (14) |
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| alfredo Replies: 92 Views: 163010 |
Forum: Featured Columns of FMF Posted: Feb 11, 2024 10:42 Subject: Re: Preparing a list of light sensitive minerals - (14) |
| "Blue sodalite"? The AI seems to have messed up. At La Fuente, in Tucson, we've had barrels of blue sodalite from both Bolivia and Brazil siting out in the burning Arizona sun for years, wi ... | |
| Topic: Need to identify black stone |
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| alfredo Replies: 21 Views: 4217 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Jan 16, 2024 23:23 Subject: Re: Need to identify black stone |
| If you have or can borrow a good gram scale, you can measure the density. That will tell us a lot. | |
| Topic: Need to identify black stone |
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| alfredo Replies: 21 Views: 4217 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Jan 16, 2024 22:02 Subject: Re: Need to identify black stone |
| You need to retake the photo and do it on a neutral grey piece of paper. On this photo, the camera focused on the background and so the black stone is much too fuzzy (out of focus) for us to tell anyt ... | |
| Topic: Iron cross twinned Pyrites from Gachalá or from Ubalá? |
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| alfredo Replies: 10 Views: 5375 |
Forum: What is it? - Where is it from? Posted: Jan 02, 2024 11:30 Subject: Re: Iron cross twinned Pyrites from Gachalá or from Ubalá? |
| The Matacana mine makes more sense, geologically, than an iron mine but, since Colombian sellers are notoriously secretive about the provenance of their wares, and mystification is de rigeur, I think ... | |
| Topic: Possible Fake: Blue Hemimorphite from Ojuela |
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| alfredo Replies: 41 Views: 62232 |
Forum: Incorrect classification and fakes Posted: Dec 31, 2023 13:23 Subject: Re: Possible Fake: Blue Hemimorphite from Ojuela |
| This thread is already well over 3 years old, but I notice that one question that was raised repeatedly in this thread was never answered, namely why was only the hemimorphite colored blue and not the ... | |
| Topic: Iron cross twinned Pyrites from Gachalá or from Ubalá? |
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| alfredo Replies: 10 Views: 5375 |
Forum: What is it? - Where is it from? Posted: Dec 31, 2023 12:03 Subject: Re: Iron cross twinned Pyrites from Gachalá or from Ubalá? |
| I think floater pyrite crystals would be unlikely to be associated with iron ore. Floater pyrites are found in shale, limestone, and some types of schist... but in iron ore? So I have doubts about tha ... | |
| Topic: Can you recommend a lab to analyse specimens |
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| alfredo Replies: 29 Views: 13029 |
Forum: Minerals and Mineralogy Posted: Nov 29, 2023 14:18 Subject: Re: Can you recommend a lab to analyse specimens |
| Luiz hasn't told us WHAT he wants to analyze. Is it a crystal? A cut gemstone? An ore sample? A rock? It's useless to recommend a lab without knowing what needs to be analyzed. If it's an ore sample, ... | |
| Topic: Who is coming to Mineralientage? |
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| alfredo Replies: 20 Views: 20313 |
Forum: Mineral Shows Posted: Sep 25, 2023 12:06 Subject: Re: Who is coming to Mineralientage? |
| "...sometimes the truffles could be on the paper menu but not on the plate!"
Sounds like Van King talking about systematik rare species dealers: "Some of those rare minerals are soo ... |
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| Topic: Who is coming to Mineralientage? |
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| alfredo Replies: 20 Views: 20313 |
Forum: Mineral Shows Posted: Sep 16, 2023 21:22 Subject: Re: Who is coming to Mineralientage? |
| For anyone thinking of going to Munich for the first time, and on a tight budget, I recommend picking a hotel in the center ("downtown" in American terms, near the main train station or &quo ... | |
| Topic: Who is coming to Mineralientage? |
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| alfredo Replies: 20 Views: 20313 |
Forum: Mineral Shows Posted: Sep 14, 2023 17:34 Subject: Re: Who is coming to Mineralientage? |
| My yearly mineralogical pilgrimage. Wouldn't miss it. | |
| Topic: Is there anything that could make you give up mineral collecting? |
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| alfredo Replies: 13 Views: 12709 |
Forum: Off-Topic and Introductions Posted: Sep 13, 2023 11:50 Subject: Re: Is there anything that could make you give up mineral collecting? |
| Another factor to consider is that lamentations about the rising price of minerals are nothing new in history. Johann Wolfgang von Goethe, famous German writer, philosopher, scientist and mineral coll ... | |
| Topic: Is there anything that could make you give up mineral collecting? |
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| alfredo Replies: 13 Views: 12709 |
Forum: Off-Topic and Introductions Posted: Sep 11, 2023 18:42 Subject: Re: Is there anything that could make you give up mineral collecting? |
| Can't collect because prices are too high? You all must be going to the wrong venues. I have no trouble finding great specimens for 3-figure prices. The problem I think is that people are much like mo ... | |
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