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26 Feb-23:53:32 Re: azurite to malachite pseudomorph research (Roger Warin)
26 Feb-22:17:49 Re: taking great photographs (Bob Harman)
26 Feb-22:16:21 Re: taking great photographs (Matt_zukowski)
26 Feb-19:35:06 Re: taking great photographs (Marvinlewinsky)
26 Feb-19:33:58 Re: taking great photographs (Marvinlewinsky)
26 Feb-16:45:01 Re: collecting and imagining. (Sante Celiberti)
26 Feb-14:52:07 Re: magnetite or franklinite? (Cascaillou)
26 Feb-14:45:44 Re: emerald fuchsite in quartz? (Cascaillou)
26 Feb-00:36:43 Re: don lum collection (Don Lum)
25 Feb-17:44:12 Re: taking great photographs (Basti)
25 Feb-17:34:51 Re: taking great photographs (Basti)
25 Feb-17:19:40 Re: taking great photographs (Basti)
25 Feb-17:06:11 Re: taking great photographs (Marvinlewinsky)
25 Feb-16:51:52 Re: collection of fiebre verde (Fiebre Verde)
25 Feb-15:49:17 Warning! the bologna show change dates! (Jordi Fabre)
25 Feb-15:24:17 Re: collection of sante celiberti - a mineralogical trip through italy (Sante Celiberti)
25 Feb-14:48:44 Re: taking great photographs (Duncan Miller)
25 Feb-14:33:49 Re: taking great photographs (Basti)
25 Feb-13:02:59 Re: taking great photographs (R Saunders)
25 Feb-12:32:05 Re: collection of fiebre verde (Philippe Durand)
25 Feb-11:57:58 Re: taking great photographs (Fuss)
25 Feb-11:10:54 Re: azurite to malachite pseudomorph research (Raystraw)
25 Feb-11:07:06 Re: taking great photographs (Jesse Fisher)
25 Feb-10:57:41 Re: azurite to malachite pseudomorph research (Jordi Fabre)
25 Feb-10:27:17 Re: collection of annemieke en rob schnerr (Rob Schnerr)

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Author Message
  Topic: Celestine
Stefan Koch

Replies: 3
Views: 317

PostForum: What is it? - Where is it from?   Posted: Feb 22, 2020 15:58   Subject: Re: Celestine
Hello Bob,

thank you very much for your help.

Knowing your thoughts on this one now, I will keep it as labeled.

Best regards,
Stefan
  Topic: Celestine
Stefan Koch

Replies: 3
Views: 317

PostForum: What is it? - Where is it from?   Posted: Feb 21, 2020 14:50   Subject: Celestine
Hi there,

I hope to get some help here for this Celestine crystal.

The attached label states "Mitchell, Indiana, USA".

In my opinion, the crystal is relatively characteristic due to ...
  Topic: Calcite
Stefan Koch

Replies: 1
Views: 797

PostForum: What is it? - Where is it from?   Posted: Jul 28, 2019 09:34   Subject: Re: Calcite
Hi Mathias.

A typical combination from the basalts at Irai, Brazil with green Celadonite and Amethyst.

Cheers
Stefan
  Topic: Need help with identification
Stefan Koch

Replies: 10
Views: 1600

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Jul 22, 2019 07:46   Subject: Re: Need help with identification
I would go for goethite instead of hematite due to the brown Color.
A simple streak test would help to confirm brown=most likely goethite vs. Red= hematite.
  Topic: Baryte?
Stefan Koch

Replies: 6
Views: 1587

PostForum: What is it? - Where is it from?   Posted: Jul 03, 2019 13:56   Subject: Re: Barite
Hi Mathias,

looks like small crystals of gypsum on typical brown Calcite (Not barite). Try the acid test. There are several locations possible, Lavrion is one of them. Oberzeiring might also be pos ...
  Topic: crystal identification help please!
Stefan Koch

Replies: 4
Views: 1206

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Apr 11, 2019 09:56   Subject: Re: crystal identification help please!
Hi Eli,

Compare your specimen with those:
https://www.mindat.org/gallery.php?loc=108598&min=478

Best regards
Stefan
  Topic: Collection of Heimo Hellwig
Stefan Koch

Replies: 672
Views: 346623

PostForum: Collection photos and Collector's page   Posted: Jan 23, 2019 04:39   Subject: Re: Collection of Heimo Hellwig
Unusual cerussite.
Hello Pierre. Yes, seems to have melted and then solidified. Maybe it has?

Hello Heimo, I think someone tried to "clean" the Cerussite using acid.

Best regards
Ste ...
  Topic: Best Labeling Material for Collection Numbers on Specimens
Stefan Koch

Replies: 15
Views: 6447

PostForum: Conserving, Preparing and Cleaning Minerals   Posted: Dec 12, 2018 05:39   Subject: Re: Best Labeling Material for Collection Numbers on Specimens
Hi there,

I use a 0.1 mm pigment liner to add my collection number and the find spot (which is the most important information getting lost easily). Then following the same procedure as Wendell Wils ...
  Topic: Tucson Show 2018
Stefan Koch

Replies: 158
Views: 120680

PostForum: News about shows   Posted: Feb 20, 2018 04:42   Subject: Re: Tucson Show 2018
Hi there,

The "Tobi" shown in the picture is Tobias Weise, the son of Christian Weise, publisher of the german mineral magazine "Lapis".

Cheers,
Stefan
 
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