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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 95 matches |
| Author | Message |
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 Topic: About cyclic twinning - (5) |
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| mmauthner Replies: 157 Views: 278565 |
 Forum: Featured Columns of FMF Posted: Aug 24, 2023 15:22 Subject: Re: About cyclic twinning - (5) |
| Thanks for researching such an intriguing story. I am a fan of that kind of digging and frequently find myself down some rabbit hole or another.
If I may, here is another translation of footnote 32: ... |
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| Topic: Mineral spirituality? |
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| mmauthner Replies: 29 Views: 30283 |
Forum: Minerals and Mineralogy Posted: Feb 16, 2021 02:56 Subject: Re: Does anyone know more about the 'Baixão claim'? |
| Ah, OK.
Good to know. Mark |
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| Topic: Mineral spirituality? |
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| mmauthner Replies: 29 Views: 30283 |
Forum: Minerals and Mineralogy Posted: Feb 15, 2021 03:04 Subject: Re: Does anyone know more about the 'Baixão claim'? |
| Hi Jordi,
I was looking up the locality for the Itinga Baixão mine for photos I had taken. In Mindat, the changes history shows that the Coronel Murta locality was once the same as the Itinga local ... |
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| Topic: Natural heat treating |
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| mmauthner Replies: 8 Views: 5688 |
Forum: Off-Topic and Introductions Posted: Dec 27, 2020 05:20 Subject: Re: Natural heat treating |
| Well, Alfredo, I am not sure about that. In fact, I am convinced that wildfires can produce heat-treated crystals. That said, I am not convinced the results in the case I have in mind were desirable. ... | |
| Topic: Names for green or yellow corundum (sapphire) |
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| mmauthner Replies: 5 Views: 4991 |
Forum: Off-Topic and Introductions Posted: Dec 26, 2020 13:34 Subject: Re: Names for green or yellow sapphire |
| Hi Tom,
Sapphires are basically classified into two groups: 'normal' sapphire, which is blue, and 'fancy' sapphire, which can be any color other than blue or the red that qualifies as ruby. Fancy s ... |
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| Topic: Gold panning |
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| mmauthner Replies: 7 Views: 6079 |
Forum: What is it? - Where is it from? Posted: Dec 21, 2019 05:06 Subject: Re: gold panning |
| Hi Roger,
I think your sphere is very possibly quite natural. Spherical gold is very interesting and not unheard of. I mention two localities producing spherical crystals in British Columbia in ... |
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| Topic: Certificates of authenticity for analyzed rare mineral specimens |
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| mmauthner Replies: 7 Views: 13027 |
Forum: Minerals and Mineralogy Posted: Jul 29, 2019 11:36 Subject: Re: Certificates of authenticity for analyzed rare mineral specimens |
| Hi Bob,
The difference you mention is true. I did not catch your meaning there from your first post. I understood you were just talking about a certificate of authenticity; in other words, somethin ... |
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| Topic: Certificates of authenticity for analyzed rare mineral specimens |
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| mmauthner Replies: 7 Views: 13027 |
Forum: Minerals and Mineralogy Posted: Jul 29, 2019 05:48 Subject: Re: Certificates of authenticity for assayed rare mineral specimens |
| Hi Bob, and All,
An interesting topic and one to which, for many reasons, I have also given some thought. The first question one might ask is Why? Why is there a need for such a certificate? ... |
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| Topic: Bismuth lost its colours. |
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| mmauthner Replies: 4 Views: 9340 |
Forum: Conserving, Preparing and Cleaning Minerals Posted: Nov 06, 2018 01:32 Subject: Re: Bismuth lost its colours. |
| Pete,
The same thing happens to the iridescent colours of the Yukon (Husky Mine) stephanites and polybasites. Actually, all of the minerals from there that have the iridescent coating... Anyone that ... |
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| Topic: Some well-deserved plaudits for Marie Huizing and Rocks & Minerals magazine |
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| mmauthner Replies: 9 Views: 41086 |
Forum: Rocks & Minerals Posted: Dec 31, 2014 15:35 Subject: Re: Some well-deserved plaudits for Marie Huizing and Rocks & Minerals magazine |
| Hear, hear... | |
| Topic: Trip to Burma organized by the Gem & Mineral Curatorial Staff of the NHMLA! |
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| mmauthner Replies: 3 Views: 15826 |
Forum: Natural History Museum of Los Angeles County Posted: Jul 20, 2014 11:16 Subject: Re: Trip to Burma organized by the Gem & Mineral Curatorial Staff of the NHMLA! |
| There is such a railway: the Siam-Burma Railway (from Tenasserim into Thailand). It is not fictional and neither are some of the stories of its building. Two movies, the famous "Bridge on the Riv ... | |
| Topic: Pyrrhotite and the Origins of Life |
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| mmauthner Replies: 9 Views: 18620 |
Forum: Minerals and Mineralogy Posted: Aug 30, 2013 16:59 Subject: Re: Pyrrhotite and the Origins of Life |
| Sorry, just saw the link. I was reading the article on my iPhone before and missed it.
Thanks! Mark |
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| Topic: Pyrrhotite and the Origins of Life |
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| mmauthner Replies: 9 Views: 18620 |
Forum: Minerals and Mineralogy Posted: Aug 30, 2013 16:52 Subject: Re: Pyrrhotite and the Origins of Life |
| Very fascinating, Cesar! And a subject somewhat dear to me.
As a student at UBC many moons ago I took a seminar class in paleobiology and the professor gave everyone a list of subjects to study then ... |
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| Topic: Spinel twins |
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| mmauthner Replies: 54 Views: 114737 |
Forum: Minerals and Mineralogy Posted: Apr 26, 2013 20:02 Subject: Re: Spinel twins in fluorite |
| The twin composition surface is still parallel to the octahedral face and a plane, making this still a contact twin. Twin laws are by definition either interpenetrant or contact depending on the law's ... | |
| Topic: Petroglyphs |
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| mmauthner Replies: 5 Views: 18267 |
Forum: Mineral Art and Artists Posted: Apr 09, 2013 03:30 Subject: Re: Petroglyphs |
| These appear rather similar to those at the Painted Rock State Park petroglyph site just north of highway 8 near Gila Bend (just west of). The attached photo is of an example of the "Gila Style&q ... | |
| Topic: Collection of Michael Shaw |
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| mmauthner Replies: 2083 Views: 2390734 |
Forum: Collection photos and Collector's page Posted: Nov 19, 2012 11:29 Subject: Re: Collection of Michael Shaw |
| Hi Mike,
Well, I cannot say that my first specimens looked that nice! Nice photo, too! Cheers, Mark |
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| Topic: Free picture of sperrylite |
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| mmauthner Replies: 3 Views: 8083 |
Forum: Off-Topic and Introductions Posted: Oct 17, 2012 01:29 Subject: Re: Free picture of sperrylite |
| Do you need images of sperrylite from other localities? I have one from the new Broken Hammer deposit, but when I get home in late Nov, I can get you images of sperrylite from the Vermilion mine (Can ... | |
| Topic: Yellow octahedral fluorite crystals |
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| mmauthner Replies: 16 Views: 24052 |
Forum: Minerals and Mineralogy Posted: May 31, 2012 09:46 Subject: Re: Yellow octahedral fluorite crystals |
| I, too, have a yellow fluorite octahedron; a nice one, as they go, from Illinois. Alas, cleaved.
None of the collections I have ever looked after contained yellow octahedral fluorite, only colorless ... |
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| Topic: Maximum number of minerals on a specimen |
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| mmauthner Replies: 37 Views: 88440 |
Forum: Minerals and Mineralogy Posted: May 23, 2012 10:54 Subject: Re: maximum number of minerals on a specimen |
| Hi David,
You might want to define "clearly visible" a bit more. Are you including specimens with micro sized crystals? That is, specimens with crystals best enjoyed under a microscope, wh ... |
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| Topic: Pyrite from Nanisivik |
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| mmauthner Replies: 15 Views: 40029 |
Forum: Minerals and Mineralogy Posted: Oct 09, 2011 20:38 Subject: Re: Pyrite from Nanisivik |
| Hello Antonio,
Sorry for the delay. I just returned from Asia where internet was very limited. As others have noted and the article indicates, there are indeed non-pseudomorphous (I hesitate to us ... |
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