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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 573 matches |
| Author | Message |
|---|---|
 Topic: Gold nugget formation from earthquake-induced piezoelectricity in quartz |
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| Matt_Zukowski Replies: 0 Views: 384 |
 Forum: Minerals and Mineralogy Posted: Sep 03, 2024 22:12 Subject: Gold nugget formation from earthquake-induced piezoelectricity in quartz |
| Thought this was interesting. The abstract:
Gold nuggets occur predominantly in quartz veins, and the current paradigm posits that gold precipitates from dilute (<1 mg kg−1 go ... |
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| Topic: what is this? A purple tourmaline grown out from the base of a skeletal quartz? |
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| Matt_Zukowski Replies: 8 Views: 1196 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Aug 14, 2024 13:33 Subject: Re: what is this? A purple tourmaline grown out from the base of a skeletal quartz? |
| Could be apatite. Are there and small broken xtals that you can remove and use for harness, etc tests? | |
| Topic: What is it? |
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| Matt_Zukowski Replies: 2 Views: 557 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Jul 28, 2024 04:51 Subject: Re: What is it? |
| My initial reaction is marcasite, but that is not listed on mindat for this mine. Perhaps it is one of the platy minerals like molybdenite or polybasite, but those are just WAGS. | |
| Topic: What is this rock |
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| Matt_Zukowski Replies: 4 Views: 719 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Jul 21, 2024 00:28 Subject: Re: What is this rock |
| vdhinesh79:
I find your posts frustrating. You post one fuzzy picture of some random rock and ask us to identify it for you. Perhaps part of my frustration comes from the fact that i don't know w ... |
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| Topic: Hematite ore |
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| Matt_Zukowski Replies: 3 Views: 550 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Jul 17, 2024 22:55 Subject: Re: Hematite ore |
| Two things:
1) With the confidence of someone who has only seen one fuzzy picture, I don't believe you have hematite, even with your streak test. If you care a lot about identifying this rock, you ... |
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| Topic: Hematite ore |
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| Matt_Zukowski Replies: 3 Views: 550 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Jul 17, 2024 21:19 Subject: Re: Hematite ore |
| Why do you think this is hematite ore? Have you had any analyses done? It looks like a plutonic rock to me with some iron staining. | |
| Topic: Is Malachite Rare? |
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| Matt_Zukowski Replies: 3 Views: 1124 |
Forum: Minerals and Mineralogy Posted: Jun 01, 2024 10:21 Subject: Is Malachite Rare? |
| I read Ed Conway's Material World substack, and his current topic is about running out of malachite, at least as a lapidary material. Is this true?
https://edconway.substack.com/p/lost-materials- ... |
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| Topic: Is it possible for this specimen of Hyalite to be associated with other minerals? |
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| Matt_Zukowski Replies: 8 Views: 1491 |
Forum: Minerals and Mineralogy Posted: Jun 01, 2024 09:51 Subject: Re: Is it possible for this specimen of Hyalite to be associated with other minerals? |
| You seem to be worried that you may have been exposed to something unhealthy by cutting one specimen of hyalite opal. I certainly wouldn't worry about it, and since the specimen is gone and you have ... | |
| Topic: Can anyone tell me if this is Stellar Beam Calciite? |
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| Matt_Zukowski Replies: 8 Views: 2940 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Feb 14, 2024 18:32 Subject: Re: Can anyone tell me if this is Stellar Beam Calciite? |
| Whether this is a "Stellar Beam" Calcite or not, we cannot tell you. Stellar Beam is some new age, mystical term, and we like to stick to science here.
As to whether it is calcite, it ce ... |
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| Topic: Identification of my mineral |
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| Matt_Zukowski Replies: 11 Views: 4007 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Jan 29, 2024 17:23 Subject: Re: Identification of my mineral |
| Your piece looks like either quartz or a carbonate like calcite. If it is quartz, it will scratch glass and will not fizz in acid. If it is calcite it will not scratch glass and it will fizz in acid ... | |
| Topic: Unknown Macedonian Crystals Help ID! |
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| Matt_Zukowski Replies: 10 Views: 5114 |
Forum: What is it? - Where is it from? Posted: Jan 12, 2024 21:04 Subject: Re: Unknown Macedonian Crystals Help ID! |
| You can upload more than one picture at a time.
I do not want to click on links I don't recognize from people I don't know, so please post the pictures. |
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| Topic: Please Help Me To Identify This Stone. |
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| Matt_Zukowski Replies: 17 Views: 7578 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Dec 16, 2023 07:10 Subject: Re: Please Help Me To Identify This Stone. |
| Are you sure of the XRF data? Those are huge concentrations of REEs. Perhaps someone else can correct me but I find it hard to believe that you found a natural rock with those concentrations. Moreo ... | |
| Topic: Can anyone help me identify the original mineral this pseudomorph? |
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| Matt_Zukowski Replies: 4 Views: 3710 |
Forum: What is it? - Where is it from? Posted: Dec 16, 2023 03:56 Subject: Re: Can anyone help me identify the original mineral this pseudomorph? |
| Are you sure these are pseudomorphs and not just corroded crystals of some kind. If they are pseudos of some bowtie habit, it could be a zeolite like stilbite, but the pictures don't make me confiden ... | |
| Topic: I want to know the sample |
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| Matt_Zukowski Replies: 21 Views: 9598 |
Forum: What is it? - Where is it from? Posted: Dec 07, 2023 19:27 Subject: Re: I want to know the sample |
| I don't see any reason to assume that these rocks are mono-mineralic. It looks like some sort of clastic rock or corroded igneous rock with a coating of cryptocrystaline quartz on one side. I am not ... | |
| Topic: Curating your collection |
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| Matt_Zukowski Replies: 11 Views: 61035 |
Forum: Conserving, Preparing and Cleaning Minerals Posted: Nov 17, 2023 22:23 Subject: Re: Curating your collection |
| To make things easier for my heirs, I hope to sell my collection before I die. In case I die before that time, my executor has a spreadsheet showing all my current pieces, collection ID number, dimen ... | |
| Topic: Isle of Skye collection. First baby steps with super macro |
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| Matt_Zukowski Replies: 11 Views: 17521 |
Forum: Micros & Macros - Images of Minerals Posted: Jul 26, 2023 01:28 Subject: Re: Isle of Skye collection. First baby steps with super macro |
| Silvia: It sounds like you are taking your pictures with the camera moving. I think you will get better pictures with a stable camera. I typically use a tripod, take one picture focused on the clos ... | |
| Topic: Jasper? |
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| Matt_Zukowski Replies: 6 Views: 9219 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: May 27, 2023 19:21 Subject: Re: Jasper? |
| Your rock doesn't look like jasper to me. It looks like a decomposing piece of felsic intrusive (like a granite) with pink K-feldspar, quartz, white plagioclase feldspar, muscovite, etc. The grainsi ... | |
| Topic: Clean and Polish Calcite |
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| Matt_Zukowski Replies: 3 Views: 18835 |
Forum: Conserving, Preparing and Cleaning Minerals Posted: May 18, 2023 16:44 Subject: Re: Clean and Polish Calcite |
| Are you sure it is calcite? Have you done a fizz test and hardness? I ask because although it certainly could be a carbonate, it looks kind of like chert. | |
| Topic: An idea for a collection |
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| Matt_Zukowski Replies: 20 Views: 17216 |
Forum: Minerals and Mineralogy Posted: May 11, 2023 01:14 Subject: Re: An idea for a collection |
| One of the big knocks on LLMs like chat GPT is that they sometimes very confidently and convincingly make things up. I have heard these called “hallucinations.” Below are some assertions that the LL ... | |
| Topic: The first 100 IUGS geological heritage sites |
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| Matt_Zukowski Replies: 2 Views: 9290 |
Forum: Mineralogical Literature Posted: Apr 11, 2023 08:21 Subject: Re: The first 100 IUGS geological heritage sites |
| I thought that I had seen this before. You posted about this book on Nov 1, 2022 and gave a link to the electronic version of the book:
https://iugs-geoheritage.org/videos-pdfs/iugs_first_100_book_v ... |
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