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Newest topics and users posts
14 Nov-07:09:48 Re: natural history museum in oslo, norway by knut eldjarn (James Catmur)
14 Nov-06:57:30 Re: the mizunaka collection (Volkmar Stingl)
14 Nov-05:21:11 The mizunaka collection - rhodochrosite with fluorapatite (Am Mizunaka)
14 Nov-04:58:28 Re: the mim museum in beirut, lebanon (Mim Museum)
13 Nov-09:41:57 Re: collection of michael shaw (Michael Shaw)
12 Nov-16:23:19 Re: the mizunaka collection - rhodochrosite (Am Mizunaka)
12 Nov-01:08:39 Re: the mizunaka collection (Volkmar Stingl)
11 Nov-22:53:04 The mizunaka collection - quartz (Am Mizunaka)
09 Nov-11:33:47 Re: contribution dr. Menor-salván - volborthite and tangeite from milpillas (mexico) - (52 (Fmf Forum)
09 Nov-11:33:11 Contribution dr. Menor-salván - volborthite and tangeite from milpillas (mexico) - (52) (Fmf Forum)
09 Nov-09:41:30 Re: collection of michael shaw (Michael Shaw)
08 Nov-06:32:28 Re: don lum collection (Carles Millan)
08 Nov-03:35:38 Re: the mim museum in beirut, lebanon (Mim Museum)
07 Nov-23:49:49 The mizunaka collection - rhodochrosite (Am Mizunaka)
07 Nov-11:19:38 Re: collection of michael shaw (Michael Shaw)
07 Nov-11:17:19 Re: intermineral liège 2024 (Bob Carnein)
06 Nov-21:33:14 Re: intermineral liège 2024 (Matt_zukowski)
06 Nov-11:15:04 Re: where is this amethyst from? (Indigo08)
06 Nov-10:46:03 Re: where is this amethyst from? (Peter Megaw)
06 Nov-09:26:30 Re: where is this amethyst from? (Indigo08)
06 Nov-09:25:29 Re: intermineral liège 2024 (James Catmur)
06 Nov-00:02:50 Re: intermineral liège 2024 (Roger Warin)
05 Nov-17:13:28 Re: in memoriam - josé zendrera has left us, but josele is still here (Firmo Espinar)
05 Nov-17:06:21 Re: intermineral liège 2024 (Michael Shaw)
05 Nov-15:17:48 Intermineral liège 2024 (Roger Warin)

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  Topic: About cyclic twinning - (5)
mmauthner

Replies: 157
Views: 296659

PostForum: 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: ...
  Topic: Mineral spirituality?
mmauthner

Replies: 29
Views: 33538

PostForum: 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
  Topic: Mineral spirituality?
mmauthner

Replies: 29
Views: 33538

PostForum: 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 ...
  Topic: Natural heat treating
mmauthner

Replies: 8
Views: 6292

PostForum: 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)
mmauthner

Replies: 5
Views: 5686

PostForum: 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 ...
  Topic: Gold panning
mmauthner

Replies: 7
Views: 6730

PostForum: 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 ...
  Topic: Certificates of authenticity for analyzed rare mineral specimens
mmauthner

Replies: 7
Views: 15407

PostForum: 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 ...
  Topic: Certificates of authenticity for analyzed rare mineral specimens
mmauthner

Replies: 7
Views: 15407

PostForum: 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?

...
  Topic: Bismuth lost its colours.
mmauthner

Replies: 4
Views: 10294

PostForum: 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 ...
  Topic: Some well-deserved plaudits for Marie Huizing and Rocks & Minerals magazine
mmauthner

Replies: 9
Views: 44968

PostForum: 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!
mmauthner

Replies: 3
Views: 16745

PostForum: 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
mmauthner

Replies: 9
Views: 19483

PostForum: 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
  Topic: Pyrrhotite and the Origins of Life
mmauthner

Replies: 9
Views: 19483

PostForum: 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 ...
  Topic: Spinel twins
mmauthner

Replies: 54
Views: 121563

PostForum: 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
mmauthner

Replies: 5
Views: 19405

PostForum: 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
mmauthner

Replies: 2169
Views: 2623805

PostForum: 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
  Topic: Free picture of sperrylite
mmauthner

Replies: 3
Views: 8508

PostForum: 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
mmauthner

Replies: 16
Views: 25562

PostForum: 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 ...
  Topic: Maximum number of minerals on a specimen
mmauthner

Replies: 37
Views: 95737

PostForum: 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 ...
  Topic: Pyrite from Nanisivik
mmauthner

Replies: 15
Views: 42641

PostForum: 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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