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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 54 matches |
| Author | Message |
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 Topic: mim Museum supports FMF! |
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| Linus Replies: 17 Views: 11374 |
 Forum: Comments & Suggestions Posted: Jan 02, 2025 13:17 Subject: Re: mim Museum supports FMF! |
| Congratulations to FMF and all of you who have worked hard to keep it going. If this news means that fmf will be with us for a good long time going forward, it is great news indeed! | |
| Topic: Sagenite agate from Bulgaria |
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| Linus Replies: 9 Views: 5931 |
Forum: Micros & Macros - Images of Minerals Posted: Aug 06, 2024 14:53 Subject: Re: Sagenite agate from Bulgaria |
| I have seen this style of agate from several locations, notably brazil and mexico. the "rutile" like features are actually strings of micro-bubbles. | |
| Topic: Is Malachite Rare? |
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| Linus Replies: 3 Views: 4310 |
Forum: Minerals and Mineralogy Posted: Jun 20, 2024 16:24 Subject: Re: Is Malachite Rare? |
| Bisbee supplied some of the most gorgeous velvety malachite on the planet, long since exhausted, alas... | |
| Topic: Nifontovite |
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| Linus Replies: 8 Views: 11105 |
Forum: Minerals and Mineralogy Posted: Dec 09, 2023 15:52 Subject: Re: Nifontovite |
| Tired of looking at those skinny clear nifontovites? For the size freaks out there, here's one of the plumpest single nifontovites Ive seen (single crystal near center right edge on the photo), 0.5&qu ... | |
| Topic: Dissolution enables dolomite crystal growth near ambient conditions |
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| Linus Replies: 9 Views: 12236 |
Forum: Mineralogical Literature Posted: Nov 24, 2023 15:48 Subject: Re: Dissolution enables dolomite crystal growth near ambient conditions |
| I like to hear of your three methods of dolomite formation. I'm particularly a fan and supporter of the third method you describe, which I have seen in the field in several important mineral districts ... | |
| Topic: Calcite geode from Idar |
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| Linus Replies: 2 Views: 5875 |
Forum: Minerals and Mineralogy Posted: Apr 21, 2023 18:27 Subject: Re: Calcite geode from Idar |
| I think its cool! Wonder whether parts of it fluoresce? | |
| Topic: Amethyst |
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| Linus Replies: 17 Views: 14281 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Feb 25, 2023 14:08 Subject: Re: Amethyst |
| Amir, I visited your quartz website, very nicely done! It really helps to clarify this situation. | |
| Topic: Amethyst |
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| Linus Replies: 17 Views: 14281 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Feb 25, 2023 13:20 Subject: Re: Amethyst |
| I see Fluorite cubes. Could you test the hardness?
I agree it looks like fluorite, I see a lot of 90 degree angles and almost no conchoidal fractures. A hardness test would be very useful - does g ... |
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| Topic: Semi-spherical exterior, radiating interior stone |
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| Linus Replies: 31 Views: 23271 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Feb 11, 2023 12:26 Subject: Re: Semi-spherical exterior, radiating interior stone |
| Hi, I do think your image of mcrowrock3 shows a centralized protrusion - thus shell is a better explanation for the spherical bottom. shell or coral, either way, I still am leaning towards fossil. The ... | |
| Topic: Semi-spherical exterior, radiating interior stone |
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| Linus Replies: 31 Views: 23271 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Feb 10, 2023 20:16 Subject: Re: Semi-spherical exterior, radiating interior stone |
| Cretaceous age fossil corals are known from the San Antonio area of south Texas, and from north of Nuevo Laaredo, both approximately 200 kms from Zapata.I have enclosed a cross section drawing of a Cr ... | |
| Topic: Semi-spherical exterior, radiating interior stone |
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| Linus Replies: 31 Views: 23271 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Feb 10, 2023 17:54 Subject: Re: Semi-spherical exterior, radiating interior stone |
| I guess the real question is, "was this transported? or found in outcrop"? judging from all the eocene sediments surrounding zapata, tx and the pronounced rounding and abrasion of the item I ... | |
| Topic: Semi-spherical exterior, radiating interior stone |
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| Linus Replies: 31 Views: 23271 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Feb 10, 2023 17:15 Subject: Re: Semi-spherical exterior, radiating interior stone |
| oh come now, fossils can easily be preserved by silica (corals in the Horquilla Formation in Southern Arizona, petrified wood; and brachiopods on the Colorado Plateau; I have seen them preserved as we ... | |
| Topic: Semi-spherical exterior, radiating interior stone |
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| Linus Replies: 31 Views: 23271 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Feb 10, 2023 14:25 Subject: Re: Semi-spherical exterior, radiating interior stone |
| I agree - fossil. Most all concretions form concentric rings, the radial pattern is not at all typical of a concretion. | |
| Topic: Brazil Amethyst |
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| Linus Replies: 1 Views: 15195 |
Forum: Mineralogical Literature Posted: May 31, 2022 18:41 Subject: Brazil Amethyst |
| Hi all! A couple months ago I ran across a brilliant old article by Rock Currier detailing one of his early trips to Rio Grande do Sul with lots of great photos. I can't find it now! Does anyone have ... | |
| Topic: Location in Romania |
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| Linus Replies: 5 Views: 6091 |
Forum: What is it? - Where is it from? Posted: Sep 30, 2021 17:31 Subject: Re: Location in Romania |
| just ran across this:
Boița is a commune in Sibiu County, Transylvania, Romania, at the foothills of the Cindrel Mountains, 22 km south of the county capital Sibiu |
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