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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 60 matches |
| Author | Message |
|---|---|
 Topic: Verdelite & Quartz ? |
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| Mathias Replies: 6 Views: 1854 |
 Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Sep 22, 2024 09:45 Subject: Re: Verdelite & Quartz ? |
| Hi Tobi thanks, this indeed seems plausible.
I wonder how this happens, from the inside to the outside it pseudomorphs into Quartz, as it seems. What would be the mechanism behind this metamorphosis? ... |
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| Topic: Verdelite & Quartz ? |
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| Mathias Replies: 6 Views: 1854 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Sep 22, 2024 06:16 Subject: Verdelite & Quartz ? |
| Some time ago I've purchased a specimen with the label:
Verdelite & Quartz, Taquaral, Minas Gerais. It is like a large green Verdelite crystal but the inside of it completely consists of presum ... |
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| Topic: Fluorite |
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| Mathias Replies: 4 Views: 7315 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Mar 06, 2023 05:06 Subject: Re: Fluorite |
| Hi, yes, I fully agree, its a super nice show, with many local vendors, most of them from within radius of 250 km. I've seen the Mario Pauwels show, there are absolute top quality specimen among them ... | |
| Topic: Fluorite |
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| Mathias Replies: 4 Views: 7315 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Mar 05, 2023 10:50 Subject: Fluorite |
| Dear All,
Today I visited a mineral exchange in Belgium, Hannut, a 90-minute drive from my home. I bought a Fluorite specimen from vendors who had most of their specimens packed in newspapers from ... |
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| Topic: Amethyst |
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| Mathias Replies: 17 Views: 12176 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Feb 25, 2023 13:40 Subject: Re: Amethyst |
| Hi here are some photos from the other specimen (I bought 2). | |
| Topic: Amethyst |
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| Mathias Replies: 17 Views: 12176 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Feb 25, 2023 12:18 Subject: Re: Amethyst |
| I see Fluorite cubes. Could you test the hardness?
Hi indeed it looks like cubes, but they aren't cubes. It is without doubt amethyst. There are a few small damages on some crystals and they are ... |
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| Topic: Amethyst |
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| Mathias Replies: 17 Views: 12176 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Feb 25, 2023 07:04 Subject: Amethyst |
| Hi all,
I've purchased 2 Amethyst specimen recently. They have strange crystallization unusual in fact. The vendor said he purchased a box of these amethysts and due to bad packing, most were damaged ... |
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| Topic: Semi-spherical exterior, radiating interior stone |
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| Mathias Replies: 31 Views: 19237 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Feb 11, 2023 00:09 Subject: Re: Semi-spherical exterior, radiating interior stone |
| Hi doesn't this fossil shelll look similar? | |
| Topic: Semi-spherical exterior, radiating interior stone |
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| Mathias Replies: 31 Views: 19237 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Feb 10, 2023 11:38 Subject: Re: Semi-spherical exterior, radiating interior stone |
| Its a fossil shell.
Dohmophyllum involutum, Columnariina. With google its easy to find similar photos. |
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| Topic: Datolite locality question |
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| Mathias Replies: 9 Views: 7717 |
Forum: What is it? - Where is it from? Posted: Aug 05, 2022 14:50 Subject: Re: Datolite locality question |
| Hi, I did an analysis, it is Calcite indeed. Nice pink color in UV light.
That's totally OK with me, I could have done this "research" before asking FMF, but I guess the specimen resembles ... |
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| Topic: Datolite locality question |
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| Mathias Replies: 9 Views: 7717 |
Forum: What is it? - Where is it from? Posted: Jul 31, 2022 13:22 Subject: Re: Datolite locality question |
| Hi Kevin,
I didn't do any testing because the vendor said it is Datolite, but from where he didn't know, which I believed. Now, during our discusion, there"s doubt. I'll do the tests, Thanks ... |
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| Topic: Datolite locality question |
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| Mathias Replies: 9 Views: 7717 |
Forum: What is it? - Where is it from? Posted: Jul 31, 2022 12:38 Subject: Re: Datolite locality question |
| Dear Kevin thanks for your reply.
Could it perhaps be that the biger crystals, on the first photo, aren't datolite at all, but Calcite? I have some greenish USA (upper new street quarry)- and also ... |
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| Topic: Datolite locality question |
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| Mathias Replies: 9 Views: 7717 |
Forum: What is it? - Where is it from? Posted: Jul 31, 2022 06:18 Subject: Datolite locality question |
| Dear FMF specialists,
I've just acquired a small batch of mineral specimens, 10 pcs, half of them are from Peru, containing Tetrahedrite, Galena sphalerite, Rhodochrosite in various combinations. ... |
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| Topic: Red Quartz |
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| Mathias Replies: 4 Views: 4214 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: May 25, 2022 06:21 Subject: Re: Red Quartz |
| Hi Tobi,
Thanks, I photographed it in bright sunlight. That makes it so red. Mathias. |
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| Topic: Red Quartz |
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| Mathias Replies: 4 Views: 4214 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: May 25, 2022 02:59 Subject: Red Quartz |
| Dear all,
I used to visit all nearby mineral shows, no matter how small. Last Sunday I've visited a small show in Schwalmtal, Germany, just 30 km from my home. There were around 10 vendors, some of ... |
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