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Newest topics and users posts
02 Jul-14:58:25 The mizunaka collection - calcite with pyrite (Am Mizunaka)
02 Jul-14:44:48 Sainte-marie-aux-mines 2022 - the new discoveries (1) (Jordi Fabre)
01 Jul-16:16:08 Re: pyromorphite and ...? (Colin Robinson)
01 Jul-13:56:47 Re: twinned topaz? (John S. White)
01 Jul-12:20:34 Re: pyromorphite and ...? (Forrestblyth)
01 Jul-11:34:01 Re: caldbeck cumbria mineral (Forrestblyth)
01 Jul-11:25:31 Re: pyromorphite and ...? (Forrestblyth)
01 Jul-10:32:27 Re: twinned topaz? (Bob Carnein)
01 Jul-10:17:29 Re: collection of volkmar stingl (Volkmar Stingl)
01 Jul-10:15:24 Re: twinned topaz? (Yannick Cosson)
01 Jul-08:51:24 Re: twinned topaz? (Pete Richards)
01 Jul-07:43:29 Re: twinned topaz? (Josele)
01 Jul-06:38:46 Re: twinned topaz? (Bob Morgan)
01 Jul-05:07:43 Twinned topaz? (Yannick Cosson)
30 Jun-23:13:16 The mizunaka collection - fluorite (Am Mizunaka)
30 Jun-16:35:12 Re: pyromorphite and ...? (Colin Robinson)
30 Jun-16:29:27 Re: collection of firmo espinar (Firmo Espinar)
30 Jun-16:27:07 Re: linarite (Colin Robinson)
30 Jun-16:18:29 Re: barytocalcite (Colin Robinson)
30 Jun-14:20:08 Re: spherical inclusions in amethyst - cristobalite? vs fluorite (Roger Warin)
30 Jun-14:06:03 Re: spherical inclusions in amethyst - cristobalite? vs fluorite (Amir Akhavan)
30 Jun-08:05:23 Baryte (Forrestblyth)
30 Jun-07:58:42 Barytocalcite (Forrestblyth)
30 Jun-07:50:45 Re: caldbeck cumbria mineral (Kevin Schofield)
30 Jun-07:49:05 Baryte (Forrestblyth)

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  Topic: Mineralogist curricula
Cesar M. Salvan

Replies: 5
Views: 868

PostForum: Off-Topic and Introductions   Posted: Mar 20, 2022 05:59   Subject: Re: Mineralogist curricula
What courses would you recommend for someone who wishes to be a mineralogist? What universities would be good to attend?
That question is pretty much ambiguous. What do you mean with the term "m ...
  Topic: Formicaite. Beta-formicaite & alpha-Ca-formate. Mineral or not? - (39)
Cesar M. Salvan

Replies: 8
Views: 1443

PostForum: Featured Columns of FMF   Posted: Mar 19, 2022 16:32   Subject: Re: Formicaite. Beta-formicaite & alpha-Ca-formate. Mineral or not? – (39)
Thank you Alfredo!. I feel good so far, but after the covid situation and all, that site pollution is the least of my problems, I am afraid!.

Anyway, it is a reasonable concern; so, during our stu ...
  Topic: Formicaite. Beta-formicaite & alpha-Ca-formate. Mineral or not? - (39)
Cesar M. Salvan

Replies: 8
Views: 1443

PostForum: Featured Columns of FMF   Posted: Mar 19, 2022 14:36   Subject: Re: Formicaite. Beta-formicaite & alpha-Ca-formate. Mineral or not? – (39)
Very interesting article, and interesting crystals. Thank you!

As for Alkali Lake in Oregon, how can one trust anything from a known toxic waste disposal site? (See "Alkali Lake Chemical Wast ...
  Topic: Goethite from Imini mine (Morocco)
Cesar M. Salvan

Replies: 0
Views: 491

PostForum: Incorrect classification and fakes   Posted: Mar 13, 2022 14:57   Subject: Goethite from Imini mine (Morocco)
The Imini mine is a famous locality for its manganese minerals, specially pyrolusite and manganite. But not all and always.
Here is a curious and big specimen from Imini mine (as far as we know) tha ...
  Topic: Alleged 'silvers' from Udokan?
Cesar M. Salvan

Replies: 13
Views: 3860

PostForum: Off-Topic and Introductions   Posted: Jan 28, 2022 19:56   Subject: Re: Alleged 'silvers' from Udokan?
Well, these analyses tell nothing apart of the elements in the analyzed point of the sample. In fact, one of them is very close to the composition of sterling silver!

A point element analysis of a ...
  Topic: Alleged 'silvers' from Udokan?
Cesar M. Salvan

Replies: 13
Views: 3860

PostForum: Off-Topic and Introductions   Posted: Oct 13, 2021 15:33   Subject: Re: Alleged 'silvers' from Udokan?
I always find interesting such 'detective' problems. When Jordi sent me the samples, the impression at hand was non-natural. The analyses showed copper-silver alloys with phase segregation and copper ...
  Topic: A new mineral: alpha-calcium formate
Cesar M. Salvan

Replies: 9
Views: 4008

PostForum: Minerals and Mineralogy   Posted: May 06, 2021 09:55   Subject: Re: A new mineral: alpha-calcium formate
A note on concepts for the gen pub here:

A same mineral could be biogenic or not. For example, sulfur, pyrite or even galena could be biogenic or the product of geochemical processes without direct ...
  Topic: A new mineral: alpha-calcium formate
Cesar M. Salvan

Replies: 9
Views: 4008

PostForum: Minerals and Mineralogy   Posted: May 02, 2021 05:17   Subject: Re: A new mineral: alpha-calcium formate
I think it is my post is relevant here, obviously. The admins are those that ultimately should decide if it is relevant here or not. If they decide it is not relevant, they should erase it and probabl ...
  Topic: A new mineral: alpha-calcium formate
Cesar M. Salvan

Replies: 9
Views: 4008

PostForum: Minerals and Mineralogy   Posted: May 01, 2021 15:56   Subject: A new mineral: alpha-calcium formate
Recently, we published the complete description of a new mineral found in the sediments of the Alkali lake (Oregon, USA).

The extraordinary crystals of what in a first view were identified as form ...
  Topic: The native gold from Guelmim-Oued Noun, Morocco - (35)
Cesar M. Salvan

Replies: 8
Views: 7893

PostForum: Featured Columns of FMF   Posted: Feb 17, 2021 19:21   Subject: Re: The native gold from Guelmim-Oued Noun, Morocco - (35)
We keep studying the gold from Guelmim. The associated minerals tell us a history that, I hope, will be consistent with the geochemical context.
The gold is associated to a series of minerals, possi ...
  Topic: The native gold from Guelmim-Oued Noun, Morocco - (35)
Cesar M. Salvan

Replies: 8
Views: 7893

PostForum: Featured Columns of FMF   Posted: Dec 29, 2020 06:08   Subject: The native gold from Guelmim-Oued Noun, Morocco - (35)
Recently, my dear friend Jordi Fabre sent me a couple of samples from a new, really interesting find: native gold from a unknown deposit (as far as I know) in the region of Guelmim-Oued Noun in Morocc ...
  Topic: On the mineralogy of Shijiangshan, Ulanhad League, Inner Mongolia A.R. (China)
Cesar M. Salvan

Replies: 15
Views: 32321

PostForum: Mines and Mineral Localities   Posted: May 27, 2018 19:33   Subject: Re: On the mineralogy of Shijiangshan, Ulanhad League, Inner Mongolia A.R. (China)
Completing this thread on this interesting mine. Beautiful johnbaumite specimens. In those crystals it is notorious that johnbaumite is the arsenic analog of hydroxylapatite.
A shout-out to Ed Richar ...
  Topic: Micro photos of inclusions in Quartz
Cesar M. Salvan

Replies: 108
Views: 103463

PostForum: Micros & Macros - Images of Minerals   Posted: Mar 06, 2018 19:25   Subject: Re: Micro photos of inclusions in Quartz
I do not know if it is a one-man thread, but just in case, I contribute with more photomicrography of inclusions in quartz.
  Topic: Milpillas Mine, Cuitaca, Municipio Santa Cruz, Sonora, Mexico
Cesar M. Salvan

Replies: 17
Views: 29868

PostForum: Mines and Mineral Localities   Posted: Mar 05, 2018 11:18   Subject: Re: Milpillas Mine, Cuitaca, Municipio Santa Cruz, Sonora, Mexico
Cesar,
Thank you for a definitive identification of this material.
Michael Shaw

My pleasure. May all the materials were as easy and fun to characterize like this. I want to extend the thanks to ...
  Topic: Milpillas Mine, Cuitaca, Municipio Santa Cruz, Sonora, Mexico
Cesar M. Salvan

Replies: 17
Views: 29868

PostForum: Mines and Mineral Localities   Posted: Mar 04, 2018 19:42   Subject: Re: Milpillas Mine, Cuitaca, Municipio Santa Cruz, Sonora, Mexico
I update this thread, now regarding this piece published by Michael Shaw ( https://www.mineral-forum.com/message-board/viewtopic.php?p=52076#52076 )
and others published in mindat.

The story is th ...
  Topic: A new find: Hoganite from Morocco
Cesar M. Salvan

Replies: 17
Views: 19800

PostForum: Minerals and Mineralogy   Posted: Feb 28, 2018 10:08   Subject: Re: A new find: Hoganite from Morocco
I think we have to assume that they are not natural.
Indeed. I'll put it in this way:

1- If the samples were natural, it would defy what we know on the biogeochemistry of acetate. As a scientist, ...
  Topic: A new find: Hoganite from Morocco
Cesar M. Salvan

Replies: 17
Views: 19800

PostForum: Minerals and Mineralogy   Posted: Feb 26, 2018 22:25   Subject: Re: A new find: Hoganite from Morocco
To shed light on this topic and apply the Ockham's Razor to the Hoganite question, I show you the result of a very simple experiment:

Just prepare a solution with a piece of copper metal in dilute ...
  Topic: A new find: Hoganite from Morocco
Cesar M. Salvan

Replies: 17
Views: 19800

PostForum: Minerals and Mineralogy   Posted: Feb 21, 2018 21:30   Subject: Re: A new find: Hoganite from Morocco
Some months ago, I received for analysis a sample of native copper from this locality covered by crystals similar to those in discussion here. The elemental analysis showed carbon and copper, but the ...
  Topic: On the mineralogy of Shijiangshan, Ulanhad League, Inner Mongolia A.R. (China)
Cesar M. Salvan

Replies: 15
Views: 32321

PostForum: Mines and Mineral Localities   Posted: Dec 03, 2017 21:09   Subject: Re: On the mineralogy of Shijiangshan, Ulanhad League, Inner Mongolia A.R. (China)
Hi Ed,

Indeed, this interesting deposit keep yielding nice specimens of rare species and also good specimens of not so rare species. For example, it recently have been found beautiful octahedral ma ...
  Topic: An opportune harvest of Gold in Serra do Caldeirão (Caldeirao) claims, Brazil - (25)
Cesar M. Salvan

Replies: 8
Views: 29514

PostForum: Featured Columns of FMF   Posted: Aug 29, 2017 05:42   Subject: Re: An opportune harvest of Gold in Serra do Caldeirão claims, Brazil - (25)
I recently received a beautiful sample of the characteristic hopper crystals of gold from this locality with request to analyze the composition.

According to the study on the geology and metallog ...
 
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