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27 Sep-03:29:08 Re: collection of tobi (Dany Mabillard)
27 Sep-02:38:15 Re: what's up with minfind? (Gregc12345)
27 Sep-02:04:20 Re: new generation for picture - ploum (Ploum)
26 Sep-13:59:25 Re: a mineralogical trip through italy by sante celiberti (Sante Celiberti)
26 Sep-13:36:46 Re: collection of tobi (Tobi)
26 Sep-10:55:50 Popular minerals - stokesite from valdemanco, madrid, spain (Jordi Fabre)
26 Sep-05:55:45 Re: collection of volkmar stingl (Volkmar Stingl)
26 Sep-00:39:01 Re: new generation for picture - ploum (Ploum)
25 Sep-18:40:06 Re: please help! shiny dark green crystals (Steve Maslansky)
25 Sep-16:25:16 Re: please help! shiny dark green crystals (Alfredo)
25 Sep-15:47:28 Re: please help! shiny dark green crystals (Kevin Schofield)
25 Sep-15:23:57 Re: please help! shiny dark green crystals (Danieljp)
25 Sep-15:21:31 Re: please help! shiny dark green crystals (Danieljp)
25 Sep-14:56:23 Re: please help! shiny dark green crystals (Riccardo Modanesi)
25 Sep-11:42:50 Re: please help! shiny dark green crystals (Alfredo)
25 Sep-09:27:30 Re: please help! shiny dark green crystals (Danieljp)
25 Sep-09:18:00 Re: please help! shiny dark green crystals (Alfredo)
25 Sep-09:14:53 Re: please help! shiny dark green crystals (Bob Carnein)
25 Sep-09:05:41 Re: please help! shiny dark green crystals (Danieljp)
25 Sep-08:58:57 Re: please help! shiny dark green crystals (Danieljp)
25 Sep-08:38:32 Please help! shiny dark green crystals (Danieljp)
25 Sep-04:49:26 Re: collection from dany mabillard (Dany Mabillard)
24 Sep-23:53:53 Re: collection of volkmar stingl (Volkmar Stingl)
24 Sep-16:03:11 Re: a mineralogical trip through italy by sante celiberti (Sante Celiberti)
24 Sep-14:19:12 Re: collection of volkmar stingl (Philippe Durand)

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  Topic: Help me please, sounds like metal
Roger Warin

Replies: 19
Views: 571

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Sep 23, 2020 10:54   Subject: Re: Help me please, sounds like metal
Does it change the direction of the compass needle?
  Topic: Help me please, sounds like metal
Roger Warin

Replies: 19
Views: 571

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Sep 23, 2020 00:02   Subject: Re: Help me please, sounds like metal
What is the density?
  Topic: Gail's collection
Roger Warin

Replies: 394
Views: 530462

PostForum: Women's Private Collections   Posted: Aug 25, 2020 07:56   Subject: Re: Gail's collection
Stunning specimens !
the most exceptional is Hauerite, I think.
Congratulations.
  Topic: Tourmaline
Roger Warin

Replies: 16
Views: 2222

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Jul 05, 2020 16:14   Subject: Re: Tourmaline
And the two poles are different.
  Topic: Tourmaline
Roger Warin

Replies: 16
Views: 2222

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Jul 05, 2020 07:34   Subject: Re: Tourmaline
I am 86 years old and tourmalines are my food.
Try to photograph your specimen in profile. You will get on a plane, the profile of your sample which you can then estimate the angle.
Mineralogy is be ...
  Topic: Mercedes cross in fluorite
Roger Warin

Replies: 9
Views: 1780

PostForum: Minerals and Mineralogy   Posted: Jun 22, 2020 15:01   Subject: Re: Mercedes cross in fluorite
Hello,
Here are some cleavages of Seilles fluorite.
It is not common to find multiple stars in the same specimen.
In this one, the identical orientation of the 4 crosses shows that the crystal latt ...
  Topic: Mercedes cross in fluorite
Roger Warin

Replies: 9
Views: 1780

PostForum: Minerals and Mineralogy   Posted: Jun 21, 2020 23:21   Subject: Re: Mercedes cross in fluorite
Hello,
In a fluorite crystal, there are 4 quaternary axes, 3 ternary axes, etc.
The direction of a 3-fold axis is [111]. This direction coincides with the optical axis of the camera.
The cleavage i ...
  Topic: Mercedes cross in fluorite
Roger Warin

Replies: 9
Views: 1780

PostForum: Minerals and Mineralogy   Posted: Jun 20, 2020 15:55   Subject: Mercedes cross in fluorite
Hello,
How can we explain this dispersion of the color centers in the shape of a cross perpendicular to a ternary axis of this fluorite?
I expected the edges (of a dodecahedron perhaps) to focus the ...
  Topic: Habit restriction of garnets
Roger Warin

Replies: 13
Views: 4067

PostForum: Minerals and Mineralogy   Posted: Jun 14, 2020 16:19   Subject: Re: Habit restriction of garnets
Hello,
The growth of the crystal is controlled in particular by the thermodynamic stability of the reticular planes, but it is also necessary to add to it the kinetics of the crystallization, very de ...
  Topic: Favourite Azurites?
Roger Warin

Replies: 44
Views: 9713

PostForum: Favourite Minerals   Posted: Apr 19, 2020 09:07   Subject: Re: Favourite Azurites?
And this one seen at the Munich Show in 2017.
  Topic: Is Mineral Collecting becoming too Superficial or has it always been so.
Roger Warin

Replies: 15
Views: 8503

PostForum: Off-Topic and Introductions   Posted: Mar 13, 2020 09:37   Subject: Re: Is Mineral Collecting becoming too Superficial or has it always been so.
I think a collection of minerals is the ship's log book that has carried us for a lifetime.
No matter how good the specimens are, if they carry souvenirs.
Of course, if the hobby opens the door to r ...
  Topic: Goethite
Roger Warin

Replies: 3
Views: 5715

PostForum: What is it? - Where is it from?   Posted: Mar 09, 2020 17:31   Subject: Re: Goethite
The needle crystals are vertically associated and form layers of successive deposits.
In addition, the wood does not contain horizontal interruptions.
  Topic: Azurite to Malachite pseudomorph research
Roger Warin

Replies: 14
Views: 11037

PostForum: Forum questions   Posted: Feb 27, 2020 06:36   Subject: Re: Azurite to Malachite pseudomorph research
Hi Peter,
I misspoke. It is not the gaseous component of the atmosphere that controls this equilibrium, but rather the concentrations of CO2 gas dissolved in hydrothermal waters, under geological con ...
  Topic: Azurite to Malachite pseudomorph research
Roger Warin

Replies: 14
Views: 11037

PostForum: Forum questions   Posted: Feb 26, 2020 23:53   Subject: Re: Azurite to Malachite pseudomorph research
Hi Ray,

Another fine example of pseudomorphism is green malachite after blue azurite, especially since often the crystals found have only been partially degraded. In this case, it is no longer an o ...
  Topic: Azurite to Malachite pseudomorph research
Roger Warin

Replies: 14
Views: 11037

PostForum: Forum questions   Posted: Feb 25, 2020 00:49   Subject: Re: Azurite to Malachite pseudomorph research
Here is a totally metamorphosed azurite crystal and another partially.
Roger.
  Topic: Azurite to Malachite pseudomorph research
Roger Warin

Replies: 14
Views: 11037

PostForum: Forum questions   Posted: Feb 24, 2020 16:13   Subject: Re: Azurite to Malachite pseudomorph research
Hello,

I wrote an article on pseudomorphosis in my club magazine AGABminibul.
I envision many examples including obviously malachite after azurite.
You should know that this is a new chemical equ ...
  Topic: The State of Modern Geology
Roger Warin

Replies: 14
Views: 10007

PostForum: Minerals and Mineralogy   Posted: Feb 16, 2020 15:44   Subject: Re: The State of Modern Geology
Hello,
I'm not sure it still is. In Europe, and particularly in Belgium, geologists find jobs in soil remediation and other sciences related to the protection of Nature.
  Topic: The Mizunaka Collection
Roger Warin

Replies: 1589
Views: 1062655

PostForum: Collection photos and Collector's page   Posted: Jan 27, 2020 16:26   Subject: Re: The Mizunaka Collection
This specimen is truly exceptional indeed. Wow!
It is difficult to photograph inclusions of ajoite or papagoite in quartz. That’s my problem anyway.
  Topic: Tucson Show 2020
Roger Warin

Replies: 104
Views: 56554

PostForum: News about shows   Posted: Jan 24, 2020 05:07   Subject: Re: Tucson Show 2020
Alfredo, thank you for your very detailed opinion.
It corresponds to the one I received from European visitors.
However, you pointed out an important thing that I didn't know: the Tucson show is a ...
  Topic: Tucson Show 2020
Roger Warin

Replies: 104
Views: 56554

PostForum: News about shows   Posted: Jan 22, 2020 16:56   Subject: Re: Tucson Show 2020
Hello Alfredo,
I’ve never seen Tucson because I don’t travel much.
In your opinion, what are the main differences between Tucson, Munich, Sainte-Marie?
Which show do you prefer? The one where you h ...
 
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