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17 May-03:14:23 Re: the mim museum in beirut, lebanon (Mim Museum)
16 May-08:20:07 Re: help with mineral identification in thin section from khibiny, kola peninsula (Daniel Garcia)
16 May-05:41:19 Re: help with mineral identification in thin section from khibiny, kola peninsula (Duncan Miller)
16 May-03:20:17 Re: help with mineral identification in thin section from khibiny, kola peninsula (Daniel Garcia)
16 May-01:49:42 Re: help with mineral identification in thin section from khibiny, kola peninsula (Duncan Miller)
15 May-22:21:35 Re: collection of volkmar stingl (Volkmar Stingl)
15 May-17:34:35 Gilbert gauthier - silvia's collection (Silvia)
15 May-09:05:40 Re: the mim museum in beirut, lebanon (Mim Museum)
15 May-06:13:55 Re: monthly mineral chronicles, mineral guides and more... (Crocoite)
15 May-02:23:13 The mizunaka collection - quartz (Am Mizunaka)
14 May-15:59:22 Re: help with mineral identification in thin section from khibiny, kola peninsula (Daniel Garcia)
14 May-12:47:43 Re: help with mineral identification in thin section from khibiny, kola peninsula (Pete Modreski)
14 May-12:03:14 Re: collection of volkmar stingl (Volkmar Stingl)
14 May-10:40:37 Help with mineral identification in thin section from khibiny, kola peninsula (Daniel Garcia)
14 May-10:25:53 Re: what is it? (Janjasina)
13 May-16:53:55 Re: silvia's collection (Silvia)
13 May-13:18:46 Re: elbaite, ending moor's head (Daniel Garcia)
13 May-10:19:46 Re: what is it? (Amir Akhavan)
13 May-10:18:08 Re: what is it? (Alfredo)
13 May-08:22:44 Re: collection of firmo espinar (Firmo Espinar)
13 May-08:22:07 Re: what is it? (Bob Morgan)
13 May-08:16:44 Re: what is it? (Firmo Espinar)
13 May-07:38:51 Re: what is it? (Fiebre Verde)
13 May-07:02:33 What is it? (Janjasina)
12 May-17:12:47 Re: silvia's collection (Firmo Espinar)

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  Topic: Photos of epitaxy - (16)
Johan Kjellman

Replies: 55
Views: 126640

PostForum: Featured Columns of FMF   Posted: Oct 20, 2021 14:47   Subject: Columbite on Samarskite
Sample 1998-8184 from Museum für Naturkunde in Berlin, type sample from Gustav Rose.
  Topic: Black, metallic, yellow oxide?
Johan Kjellman

Replies: 24
Views: 6112

PostForum: What is it? - Where is it from?   Posted: Jul 24, 2021 12:18   Subject: Re: Black, metallic, yellow oxide?
I'm debating on the Connecticut provenance though, could also be Rwanda, Uganda... I'm hoping I may be able to tie that down too. You guys have been very helpful. I'm about 95% convinced on the specie ...
  Topic: Bob Cook wins the 2021 John S. White Mineral Legacy Award
Johan Kjellman

Replies: 2
Views: 2235

PostForum: The histories behind mineral specimens   Posted: May 01, 2021 12:58   Subject: Re: Bob Cook wins the 2021 John S. White Mineral Legacy Award
Bobcookite not cookeite!

cheers
____________________________________________

Fixed. Thanks Johan!
  Topic: Aragonite "drill bit" twin
Johan Kjellman

Replies: 16
Views: 14562

PostForum: Minerals and Mineralogy   Posted: Mar 31, 2020 06:29   Subject: Re: aragonite "drill bit" twin
Also, note that Haüy always publish individual images of the separate contributing crystals for the twin formations - each one in its actual orientation. In this case, figures 236-239.

cheers
  Topic: Aragonite "drill bit" twin
Johan Kjellman

Replies: 16
Views: 14562

PostForum: Minerals and Mineralogy   Posted: Mar 31, 2020 06:26   Subject: Re: aragonite "drill bit" twin
Thanks, Johan and Jordi. What I'm seeing in the figure appears to have 2-fold symmetry (2 crystals intergrown). My specimen definitely has 3-fold symmetry around the twin axis. The forms present ap ...
  Topic: Aragonite "drill bit" twin
Johan Kjellman

Replies: 16
Views: 14562

PostForum: Minerals and Mineralogy   Posted: Mar 30, 2020 15:46   Subject: Re: aragonite "drill bit" twin
Thanks. Can you possibly scan that figure? Or is it available on-line (I did a search but was unable to find it).

Bob,
I just pm'd you the link as it couldn't be posted here. PM me your email if ...
  Topic: Aragonite "drill bit" twin
Johan Kjellman

Replies: 16
Views: 14562

PostForum: Minerals and Mineralogy   Posted: Mar 30, 2020 06:22   Subject: Re: aragonite "drill bit" twin
Actually, your twin resembles very much figures 234 and 235 on plate 86, the last one in Haüy's atlas from 1801.

cheers
  Topic: Malachite twinning
Johan Kjellman

Replies: 5
Views: 12270

PostForum: Minerals and Mineralogy   Posted: Mar 08, 2020 06:27   Subject: Re: Malachite twinning
Someone claimed that all malachite is twinned.

Does anyone know of any discussion or papers to this effect?

Best,

Ray

Order-disorder twinning of malachite
Makovicky, Emil (Institute of Ge ...
  Topic: The Joy of Tucson, 2020 Gail Spann Experience
Johan Kjellman

Replies: 107
Views: 98097

PostForum: Mineral Shows by Gail Spann   Posted: Feb 05, 2020 11:15   Subject: Re: The Joy of Tucson, 2020 Gail Spann Experience
thanks, I figured - there is one "different but the same" on mindat
cheers
  Topic: The Joy of Tucson, 2020 Gail Spann Experience
Johan Kjellman

Replies: 107
Views: 98097

PostForum: Mineral Shows by Gail Spann   Posted: Feb 05, 2020 04:46   Subject: Re: The Joy of Tucson, 2020 Gail Spann Experience
And another view...
Excellent specimen, and a great example of hematite/rutile epitaxy.
Is there a more specific location?
 
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