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Newest topics and users posts
18 Jan-18:36:38 The mizunaka collection - smoky quartz (Am Mizunaka)
18 Jan-17:35:15 Re: don lum collection (Don Lum)
18 Jan-11:27:14 Re: collection of ras (Robert Seitz)
18 Jan-09:50:00 Re: collection of michael shaw - ilvaite (Michael Shaw)
18 Jan-04:29:58 Re: collection of ras (Tobi)
17 Jan-22:53:41 Re: silvia's collection (Silvia)
17 Jan-22:42:23 The mizunaka collection - quartz (Am Mizunaka)
17 Jan-12:30:52 Re: collection of ras (Robert Seitz)
17 Jan-05:34:24 Re: collection of firmo espinar (Tobi)
17 Jan-04:08:41 Re: collection of sante celiberti (Tobi)
17 Jan-04:02:37 Re: silvia's collection (Tobi)
17 Jan-03:52:12 Re: tucson shows 2022 (Tobi)
16 Jan-08:33:31 Re: apophyllite from brazil - a new find from 2021? (Gagat Minerals)
15 Jan-22:46:01 Re: tucson shows 2022 - it's starting!! (Alfredo)
15 Jan-22:29:08 Re: tucson shows 2022 - it's starting!! (Bob Harman)
15 Jan-22:23:43 Re: apophyllite from brazil - a new find from 2021? (Alfredo)
15 Jan-22:19:22 The mizunaka collection - thin quartz (Am Mizunaka)
15 Jan-19:31:17 Apophyllite from brazil - a new find from 2021? (Gagat Minerals)
15 Jan-18:40:57 Re: alleged 'silvers' from udokan? (Bob Harman)
15 Jan-17:48:47 Tucson shows 2022 (Bob Kerr)
15 Jan-17:32:21 Re: alleged 'silvers' from udokan? (Alfredo)
15 Jan-16:52:31 Re: alleged 'silvers' from udokan? (Bob Harman)
15 Jan-16:23:26 Re: collection of michael shaw (Michael Shaw)
15 Jan-16:21:55 Chalcostibite - silvia's collection (Silvia)
15 Jan-14:22:05 Re: collection of sante celiberti (Sante Celiberti)

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  Topic: Mineral spirituality?
mmauthner

Replies: 29
Views: 18594

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: 18594

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: 3148

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: 2483

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: 3801

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: 9885

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: 9885

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: 6509

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: 28939

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: 12664

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: 15103

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: 15103

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: 89893

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: 14991

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: 1742
Views: 1717495

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: 6330

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: 19246

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: 61381

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: 31351

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 ...
  Topic: FMF party in Tucson, 2012. You coming?
mmauthner

Replies: 49
Views: 89049

PostForum: Mineral Shows by Gail Spann   Posted: Aug 10, 2011 11:06   Subject: Re: FMF party in Tucson, 2012. You coming?
Count me in, please!

See you all there!

Mark
 
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