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18 Sep-05:25:58 Re: malachite stalactites, katanga province (Jordi Fabre)
18 Sep-05:18:45 Re: malachite stalactites, katanga province (Peter Lemkin)
18 Sep-04:56:09 Malachite stalactites, katanga province (Roger Warin)
17 Sep-09:46:55 Re: tracing the dealer "minerals engineering" or brian petrovic (Tomcotterell)
17 Sep-09:30:37 Re: tracing the dealer "minerals engineering" or brian petrovic (Peter Megaw)
17 Sep-07:57:26 Minfind dot com is back! (Bob Kerr)
17 Sep-07:46:04 Re: sold as “green stilbite” (Alfredo)
17 Sep-07:18:23 Tracing the dealer "minerals engineering" or brian petrovic (Tomcotterell)
17 Sep-06:28:12 Re: sold as “green stilbite” (Charly H)
16 Sep-15:44:40 Re: sold as “green stilbite” (Pete Richards)
16 Sep-10:54:45 Re: sold as “green stilbite” (Charly H)
16 Sep-10:36:43 Re: sold as “green stilbite” (Bergur_e_sigurdarson)
16 Sep-10:12:03 Re: sold as “green stilbite” (Charly H)
16 Sep-05:57:03 Re: sold as “green stilbite” (Charly H)
16 Sep-05:55:13 Re: sold as “green stilbite” (Charly H)
16 Sep-01:26:21 Re: fulgurite (Peter Lemkin)
16 Sep-00:42:43 Re: sold as “green stilbite” (Jordi Fabre)
15 Sep-22:29:50 Re: sold as “green stilbite” (Matt_zukowski)
15 Sep-20:31:13 Re: sold as “green stilbite” (Bergur_e_sigurdarson)
15 Sep-20:14:50 Sold as “green stilbite” (Charly H)
15 Sep-17:02:00 Re: online catalog of the minerals of the igme collections - madrid community (Firmo Espinar)
15 Sep-16:16:11 Re: collection of sante celiberti (Sante Celiberti)
15 Sep-16:03:04 Re: fulgurite (B Glassburn)
15 Sep-09:59:38 Re: fulgurite (Matt_zukowski)
15 Sep-09:56:05 Re: fulgurite (Josele)

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  Topic: Online catalog of the minerals of the IGME collections - Madrid Community
Bob Morgan

Replies: 4
Views: 17805

PostForum: IGME (Instituto Geológico y Minero de España)   Posted: Sep 15, 2021 09:28   Subject: Re: Online catalog of the minerals of the IGME collections - Madrid Community
Years ago my wife talked me into going to Spain rather than Tucson. This place made it all worthwhile. As a beginning pyrite enthusiast there was the most interesting pyrite I've ever seen, just to th ...
  Topic: About FMF Homepage
Bob Morgan

Replies: 6
Views: 659

PostForum: Off-Topic and Introductions   Posted: Sep 11, 2021 05:09   Subject: Re: About FMF Homepage
Wow!
Thank You, all of you administrators.
  Topic: Round rocks, mineral or artifacts?
Bob Morgan

Replies: 5
Views: 671

PostForum: What is it? - Where is it from?   Posted: Aug 30, 2021 09:03   Subject: Re: Round rocks, mineral or artifacts?
I have a couple of similar balls, neither of which are sandstone. 'Got them years ago before I realized how important locality information is. One is almost like granite, the other is probably marble. ...
  Topic: Green botryoidal formation
Bob Morgan

Replies: 6
Views: 536

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Aug 28, 2021 09:49   Subject: Re: Green botryoidal formation
What is the black mineral on your specimen? On mindat there are a couple of photo's of malachite with botryoidal hematite.
  Topic: Pyrite From Gavorrano?
Bob Morgan

Replies: 14
Views: 1461

PostForum: What is it? - Where is it from?   Posted: Aug 22, 2021 16:02   Subject: Re: Pyrite From Gavorrano?
I agree with Niccioletta. The bottom crystal of Photo 1TM-J8Y on Mindat has a squared off hillock -perhaps due to growth related to a adjacent crystal that isn't there. Photo QXC-LQA has blocky struct ...
  Topic: Don Lum Collection
Bob Morgan

Replies: 1736
Views: 1433777

PostForum: Collection photos and Collector's page   Posted: Aug 13, 2021 18:41   Subject: Re: Don Lum Collection
Sorry I missed the first photo and the quartz. OK the light effect along with the shape to the upper right had me seeing calcite. Thanks for the correction.
  Topic: Don Lum Collection
Bob Morgan

Replies: 1736
Views: 1433777

PostForum: Collection photos and Collector's page   Posted: Aug 13, 2021 07:39   Subject: Re: Don Lum Collection
Wonderful overgrowth. It appears to me that calcite is mainly involved rather than quartz.
  Topic: About cyclic twinning - (5)
Bob Morgan

Replies: 144
Views: 203172

PostForum: Featured Columns of FMF   Posted: Aug 05, 2021 11:42   Subject: Re: About cyclic twinning - (5)
Although marcasite doesn't make an exact fiveling, there are drawings in Vol. VI of Goldschmidt's Atlas der Krystallformen on Tafel 6 no's. 87, 91-95. I believe the original reports might be available ...
  Topic: Celestite geode in dolomite block? Or what, halite?
Bob Morgan

Replies: 4
Views: 785

PostForum: What is it? - Where is it from?   Posted: Jul 25, 2021 08:13   Subject: Re: Celestite geode in dolomite block? Or what, halite?
The closeup shot 14-06-28 looks like a calcite crystal with the c-axis being where the bright spot is and the trigonal morphology around it.
Could the saltiness just be a coating from exposure to an ...
  Topic: Unknown mineral from Pikes Peak pegmatite
Bob Morgan

Replies: 23
Views: 2802

PostForum: What is it? - Where is it from?   Posted: Jul 23, 2021 09:03   Subject: Re: Unknown mineral from Pikes Peak pegmatite
Quartz does take this habit sometimes. I've heard the nickname of 'saber quartz' for that. Two opposing prism faces are very narrow or completely missing causing it to have a pseudo orthorhombic appea ...
  Topic: Black, metallic, yellow oxide?
Bob Morgan

Replies: 23
Views: 1871

PostForum: What is it? - Where is it from?   Posted: Jul 21, 2021 15:06   Subject: Re: black, metallic, yellow oxide?
Could it be sulphur in a limonite pseudomorph of pyrite?
  Topic: The Mizunaka Collection
Bob Morgan

Replies: 1809
Views: 1377931

PostForum: Collection photos and Collector's page   Posted: Jun 23, 2021 08:11   Subject: Re: The Mizunaka Collection
Several years ago I bought one of these for the fluorite inclusions (interesting fluorite habit) and later recognized it also was a Japan Law twin. Perhaps the smaller crystal has that orientation too ...
  Topic: Favourite Quartzes?
Bob Morgan

Replies: 58
Views: 53168

PostForum: Favourite Minerals   Posted: Jun 23, 2021 07:56   Subject: Re: Favourite Quartzes?
I'm enjoying your quartzes very much, particularly the lattice pieces,'gitterquartz'.. The Baveno twin explanation was new to me. I'm interested in quartz-feldspar epitaxy. Do you know of anything wr ...
  Topic: Unknown mineral from Pikes Peak pegmatite
Bob Morgan

Replies: 23
Views: 2802

PostForum: What is it? - Where is it from?   Posted: Jun 13, 2021 22:02   Subject: Re: Unknown mineral from Pikes Peak pegmatite
How about Spodumene. I have a couple of pieces that have etching striations that run that way. There doesn't appear to be any from that area in the photos on Mindat. but maybe...
  Topic: Aura Coating
Bob Morgan

Replies: 15
Views: 2626

PostForum: Incorrect classification and fakes   Posted: Jun 06, 2021 09:03   Subject: Re: Aura Coating
Thanks John, 'sounds like stirring a witches brew. I've cooked stainless steel in nitric acid. I'm assuming this is no more dangerous than that - avoiding fumes and neutralizing the solution and not p ...
  Topic: Aura Coating
Bob Morgan

Replies: 15
Views: 2626

PostForum: Incorrect classification and fakes   Posted: Jun 02, 2021 09:13   Subject: Re: Aura Coating
Thanks John,
I'm actually dealing with a candy red coating. At this point Ive gotten better examples of the same crystallography and will probably not bother to try to remove anything.
  Topic: Aura Coating
Bob Morgan

Replies: 15
Views: 2626

PostForum: Incorrect classification and fakes   Posted: May 28, 2021 08:49   Subject: Re: Aura Coating
That raises a question. How can such coating be removed? Years ago I was looking for quartz crystals with unusual faces. Behind the Days End Motel in Tucson there were large tables of crystals. The on ...
  Topic: Calcite form
Bob Morgan

Replies: 6
Views: 1388

PostForum: Minerals and Mineralogy   Posted: Apr 25, 2021 17:51   Subject: Re: Calcite form
I've become more of a sceptic about so many forms. Tokody listed 459 for pyrite. Most are doubtful. Kostov wrote Calcite forms exceeded 620 (Crystal Habits of Minerals) I think I saw an article in Ger ...
  Topic: The Mizunaka Collection
Bob Morgan

Replies: 1809
Views: 1377931

PostForum: Collection photos and Collector's page   Posted: Apr 25, 2021 11:56   Subject: Re: The Mizunaka Collection
What an interesting inside structure. Would it be kin to spirals seen in the center of some beryls?
  Topic: The Mizunaka Collection
Bob Morgan

Replies: 1809
Views: 1377931

PostForum: Collection photos and Collector's page   Posted: Apr 24, 2021 08:33   Subject: Re: The Mizunaka Collection
There is a Rock Currier photo of this specimen on Mindat with the locality info. It is photo E2X-FTF. and is from Pakistan
 
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