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The information provided within this Forum about localities is only given to allow reference to them. Any visit to any of the localities requires you to obtain full permission and relevant information prior to your visit. FMF is strictly against any illicit activities related to collecting minerals.
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| Search found 140 matches |
| Author | Message |
|---|---|
 Topic: Online catalog of the minerals of the IGME collections - Madrid Community |
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| Bob Morgan Replies: 4 Views: 17805 |
 Forum: 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 |
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| Bob Morgan Replies: 6 Views: 659 |
Forum: Off-Topic and Introductions Posted: Sep 11, 2021 05:09 Subject: Re: About FMF Homepage |
| Wow!
Thank You, all of you administrators. |
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| Topic: Round rocks, mineral or artifacts? |
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| Bob Morgan Replies: 5 Views: 671 |
Forum: 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 |
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| Bob Morgan Replies: 6 Views: 536 |
Forum: 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? |
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| Bob Morgan Replies: 14 Views: 1461 |
Forum: 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 |
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| Bob Morgan Replies: 1736 Views: 1433777 |
Forum: 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 |
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| Bob Morgan Replies: 1736 Views: 1433777 |
Forum: 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) |
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| Bob Morgan Replies: 144 Views: 203172 |
Forum: 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? |
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| Bob Morgan Replies: 4 Views: 785 |
Forum: 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 ... |
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| Topic: Unknown mineral from Pikes Peak pegmatite |
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| Bob Morgan Replies: 23 Views: 2802 |
Forum: 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? |
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| Bob Morgan Replies: 23 Views: 1871 |
Forum: 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 |
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| Bob Morgan Replies: 1809 Views: 1377931 |
Forum: 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? |
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| Bob Morgan Replies: 58 Views: 53168 |
Forum: 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 |
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| Bob Morgan Replies: 23 Views: 2802 |
Forum: 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 |
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| Bob Morgan Replies: 15 Views: 2626 |
Forum: 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 |
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| Bob Morgan Replies: 15 Views: 2626 |
Forum: 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. |
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| Topic: Aura Coating |
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| Bob Morgan Replies: 15 Views: 2626 |
Forum: 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 |
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| Bob Morgan Replies: 6 Views: 1388 |
Forum: 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 |
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| Bob Morgan Replies: 1809 Views: 1377931 |
Forum: 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 |
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| Bob Morgan Replies: 1809 Views: 1377931 |
Forum: 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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