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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 721 matches |
| Author | Message |
|---|---|
 Topic: A nice find on a mountain walk |
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| Peter Megaw Replies: 4 Views: 1110 |
 Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Jul 30, 2025 08:23 Subject: Re: A nice find on a mountain walk |
| If it's that hard and reactive it is probably quartz. The banded textures indicate it may be a vein or other fracture filling. Is the blue green color showing under UV or sunlight? | |
| Topic: A nice find on a mountain walk |
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| Peter Megaw Replies: 4 Views: 1110 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Jul 29, 2025 08:11 Subject: Re: A nice find on a mountain walk |
| Hi Marius, nice hike!
First guess is that it is calcite, if you can scratch it easily with a knife or nail and it fizzes if you put a drop of vinegar on it, that's probably what it is. Calcite i ... |
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| Topic: cristobalite vs chalcedony in thin section |
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| Peter Megaw Replies: 16 Views: 23322 |
Forum: Minerals and Mineralogy Posted: Apr 08, 2025 09:08 Subject: Re: cristobalite vs chalcedony in thin section |
| Robert Folk taught that length-slow chalcedony was indicative of formation under evaporitic or sulfate rich conditions. If you have a gyp plate you could check that out | |
| Topic: "Geode" Mineral Identification |
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| Peter Megaw Replies: 15 Views: 12669 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Mar 04, 2025 15:16 Subject: Re: "Geode" Mineral Identification |
| This does not look like any of the geodes from Chihuahua...most of them fluoresce brilliant yellow-green from uranyl activation.
The lumpiness and carbonate rind suggest something more like a " ... |
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| Topic: Stellerite specimens from Piedra Parada, Mexico |
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| Peter Megaw Replies: 8 Views: 6601 |
Forum: Minerals and Mineralogy Posted: Feb 21, 2025 10:05 Subject: Re: Stellerite specimens from Piedra Parada, Mexico |
| Raman work at the UA several years ago identified stellerite, stilbite, heulandite, chabazite, clinoptilolite and related species from the complex zeolite coatings over smoky quartz and feldspar pegma ... | |
| Topic: Locality clarification or where is it from? |
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| Peter Megaw Replies: 8 Views: 4531 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Dec 31, 2024 13:02 Subject: Re: Locality clarification or where is it from? |
| Geographically that is correct...but geologically Illinois is closer to Elmwood (MVT sensu latu) than Mexico (CRD). That red sphalerite is a good sign of MVT | |
| Topic: Locality clarification or where is it from? |
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| Peter Megaw Replies: 8 Views: 4531 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Dec 29, 2024 14:45 Subject: Re: Locality clarification or where is it from? |
| There are a lot of possible sources based on the fluorite shape and color...but the matrix looks wrong for Ojuela. I think the red is not a coating but actually makes up the matrix as a layered granu ... | |
| Topic: Lego Rhodochrosite, Amethyst Geode, Black Tourmaline with Aquamarine, Orange Quartz, Emera |
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| Peter Megaw Replies: 10 Views: 8467 |
Forum: Minerals and Mineralogy Posted: Nov 21, 2024 09:48 Subject: Re: Lego Rhodochrosite, Amethyst Geode, Black Tourmaline with Aquamarine, Orange Quartz, E |
| Lego says it is not official yet, so cannot be displayed until it is | |
| Topic: Lego Rhodochrosite, Amethyst Geode, Black Tourmaline with Aquamarine, Orange Quartz, Emera |
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| Peter Megaw Replies: 10 Views: 8467 |
Forum: Minerals and Mineralogy Posted: Nov 20, 2024 13:47 Subject: Re: Lego Rhodochrosite, Amethyst Geode, Black Tourmaline with Aquamarine, Orange Quartz, E |
| Does anyone know how to get ahold of the guy/gal behind this?
Make a great exhibit for TGMS |
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| Topic: Where is this amethyst from? |
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| Peter Megaw Replies: 4 Views: 2814 |
Forum: What is it? - Where is it from? Posted: Nov 06, 2024 10:46 Subject: Re: Where is this amethyst from? |
| clearly from a vein deposit. ...very likely Guanajuato, Mexico | |
| Topic: Galena from Hiendelaencina |
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| Peter Megaw Replies: 8 Views: 4548 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Oct 02, 2024 10:46 Subject: Re: Galena from Hiendelaencina |
| With those overgrowths it looks more like Tri-State/Old Lead Belt (Kansas?) rather than Viburnum. Doesn't look right for the Baxter Mine, but possibly ha neighborhood | |
| Topic: An interesting Colorado "Gold Specimen" Story |
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| Peter Megaw Replies: 1 Views: 6791 |
Forum: Incorrect classification and fakes Posted: Jun 19, 2024 10:14 Subject: Re: An interesting Colorado "Gold Specimen" Story |
| Great piece Bob...I think I can fill a few gaps in the story...
Shortly after I first moved to Tucson in 1979, Richard opened Bideaux Minerals on the north side of Miracle Mile, just west of the Gh ... |
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| Topic: In memoriam - George Robinson, a man of science, passed away |
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| Peter Megaw Replies: 3 Views: 7450 |
Forum: In Memoriam Posted: Apr 23, 2024 17:44 Subject: Re: In memoriam - George Robinson, a man of science, passed away |
| Knew George for many years...still have a cute Thunder Bay amethyst I got from them back when they were digging and dealing.
Didn't know about the Ragtime though...LOVE it! One by one time mar ... |
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| Topic: Locality? |
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| Peter Megaw Replies: 5 Views: 5067 |
Forum: What is it? - Where is it from? Posted: Apr 14, 2024 07:32 Subject: Re: Locality? |
| Ask Bill Dameron...Barite Bill! | |
| Topic: Are there any big mineral shows in canada? |
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| Peter Megaw Replies: 5 Views: 8200 |
Forum: Mineral Shows Posted: Mar 10, 2024 09:15 Subject: Re: Are there any big mineral shows in canada? |
| Biggest I know of is the Bancroft Show....lots of self collectors | |
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