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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 10 matches |
| Author | Message |
|---|---|
 Topic: Photos of epitaxy - (16) |
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| Johan Kjellman Replies: 55 Views: 126640 |
 Forum: 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? |
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| Johan Kjellman Replies: 24 Views: 6112 |
Forum: 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 |
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| Johan Kjellman Replies: 2 Views: 2235 |
Forum: 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! |
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| Topic: Aragonite "drill bit" twin |
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| Johan Kjellman Replies: 16 Views: 14562 |
Forum: 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 |
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| Topic: Aragonite "drill bit" twin |
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| Johan Kjellman Replies: 16 Views: 14562 |
Forum: 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 |
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| Johan Kjellman Replies: 16 Views: 14562 |
Forum: 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 ... |
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| Topic: Aragonite "drill bit" twin |
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| Johan Kjellman Replies: 16 Views: 14562 |
Forum: 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 |
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| Topic: Malachite twinning |
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| Johan Kjellman Replies: 5 Views: 12270 |
Forum: 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 ... |
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| Topic: The Joy of Tucson, 2020 Gail Spann Experience |
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| Johan Kjellman Replies: 107 Views: 98097 |
Forum: 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 |
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| Topic: The Joy of Tucson, 2020 Gail Spann Experience |
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| Johan Kjellman Replies: 107 Views: 98097 |
Forum: 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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