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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 47 matches |
| Author | Message |
|---|---|
 Topic: Cleaning fluorapatite |
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| Robson Vieira Replies: 4 Views: 575 |
 Forum: Conserving, Preparing and Cleaning Minerals Posted: Jun 07, 2025 14:44 Subject: Re: Cleaning fluorapatite |
| You can check this on the Spanish side of FMF:
"Limpieza de Fluorapatito" Oh thanks friend, i have just read it. |
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| Topic: Cleaning fluorapatite |
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| Robson Vieira Replies: 4 Views: 575 |
Forum: Conserving, Preparing and Cleaning Minerals Posted: Jun 07, 2025 14:42 Subject: Re: Cleaning fluorapatite |
| With great care, I suspect. Let's see what the experts say
Yeah. We always fear to get wrong |
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| Topic: Cleaning fluorapatite |
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| Robson Vieira Replies: 4 Views: 575 |
Forum: Conserving, Preparing and Cleaning Minerals Posted: Jun 05, 2025 21:09 Subject: Cleaning fluorapatite |
| Hi there,
I have a tiny but nice fluorapatite from Sapo Mine, Brazil, and even though I'm happy with it, I realized it has a kind of powder on it, masking its best shine possibilities. How could I cl ... |
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| Topic: Limonitized garnet? |
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| Robson Vieira Replies: 36 Views: 12689 |
Forum: What is it? - Where is it from? Posted: Jan 26, 2025 09:00 Subject: Re: Limonitized garnet? |
| I'm very grateful for the help you all provided to me, especially in terms of clearance your points over the topic that allowed me to identify and better yet, understand related questions about enviro ... | |
| Topic: Limonitized garnet? |
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| Robson Vieira Replies: 36 Views: 12689 |
Forum: What is it? - Where is it from? Posted: Jan 26, 2025 08:54 Subject: Re: Limonitized garnet? |
| Thus:
a garnet crystal, having the (classic) shape of a rhombic dodecahedron, has been replaced by a mixture of iron oxides & hydroxides, thereby retaining the shape of the original crystal. Sinc ... |
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| Topic: Limonitized garnet? |
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| Robson Vieira Replies: 36 Views: 12689 |
Forum: What is it? - Where is it from? Posted: Jan 26, 2025 08:49 Subject: Re: Limonitized garnet? |
| Hello,
I believe in a pseudomorphosis of a garnet. The texture of this specimen is not that of a crystal. I think we often forget that water is an extracting agent of SiO2. Obviously the water mus ... |
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| Topic: Limonitized garnet? |
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| Robson Vieira Replies: 36 Views: 12689 |
Forum: What is it? - Where is it from? Posted: Jan 24, 2025 11:29 Subject: Re: Limonitized garnet? |
| OK, these certainly look like a simple rhombic dodecahedron.
It was my very first impression. I think it is not a shame to call it a garnet. |
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| Topic: Limonitized garnet? |
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| Robson Vieira Replies: 36 Views: 12689 |
Forum: What is it? - Where is it from? Posted: Jan 24, 2025 11:27 Subject: Re: Limonitized garnet? |
| The square outline with 90 degree angles is made by 4 dodecahedral faces around the middle of the crystal as you look down on it from the top. In the first photo there are still 4 faces forming a pyra ... | |
| Topic: Limonitized garnet? |
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| Robson Vieira Replies: 36 Views: 12689 |
Forum: What is it? - Where is it from? Posted: Jan 24, 2025 06:06 Subject: Re: Limonitized garnet? |
| Hello People. I'm adding more pics of the crystal. The first pic is one that shows the cubic profile of that axis and the other three are at same axis but rotated 90°, showing the 4 faces of that axis ... | |
| Topic: Limonitized garnet? |
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| Robson Vieira Replies: 36 Views: 12689 |
Forum: What is it? - Where is it from? Posted: Jan 24, 2025 04:15 Subject: Re: Limonitized garnet? |
| The number of faces will tell us what combination of forms it is.
I assume we agree it is either a combination of an octahedron and a cube, = 8 + 6 = 14 faces, or a combination of a dodecahedron a ... |
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| Topic: Limonitized garnet? |
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| Robson Vieira Replies: 36 Views: 12689 |
Forum: What is it? - Where is it from? Posted: Jan 24, 2025 04:11 Subject: Re: Limonitized garnet? |
| I agree with the foregoing. But I also think the second photo shows a flat (more or less) face perpendicular to what would be a 4-fold symmetry axis of the rhomb dodecahedron. This would be a cube ( ... | |
| Topic: Limonitized garnet? |
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| Robson Vieira Replies: 36 Views: 12689 |
Forum: What is it? - Where is it from? Posted: Jan 24, 2025 04:07 Subject: Re: Limonitized garnet? |
| What I meant was that the fact that a mineral occurs at all in large quantities in alluvium means that that mineral is not very susceptible to chemical or physical weathering. In other words it is a t ... | |
| Topic: Limonitized garnet? |
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| Robson Vieira Replies: 36 Views: 12689 |
Forum: What is it? - Where is it from? Posted: Jan 23, 2025 12:50 Subject: Re: Limonitized garnet? |
| Almandine garnets are often found in alluvial deposits, and so would seem to be immune from weathering, and yet there are nevertheless many locations on this planet where almandine has completely alte ... | |
| Topic: Limonitized garnet? |
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| Robson Vieira Replies: 36 Views: 12689 |
Forum: What is it? - Where is it from? Posted: Jan 23, 2025 12:46 Subject: Re: Limonitized garnet? |
| It's a simple rhombic dodecahedron. Garnets can deteriorate into rust. I'm not sure of the process but have collected softball sized ones from Little Pine Mine in North Carolina that crumble in your h ... | |
| Topic: Limonitized garnet? |
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| Robson Vieira Replies: 36 Views: 12689 |
Forum: What is it? - Where is it from? Posted: Jan 22, 2025 15:11 Subject: Re: Limonitized garnet? |
| The second photo looks to me like a combination cube and octahedron (that would have 14 faces), which would not be found in garnet. If that's the case, it's likely a pyrite crystal that has been repl ... | |
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