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A general guide for using the Forum with some rules and tips
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 110 matches |
| Author | Message |
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 Topic: Help with mineral identification in thin section from Khibiny, Kola peninsula |
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| Duncan Miller Replies: 6 Views: 549 |
 Forum: Minerals and Mineralogy Posted: May 16, 2022 05:41 Subject: Re: Help with mineral identification in thin section from Khibiny, Kola peninsula |
| I don't know if the colour and pleochroism are diagnostic, but your images certainly "look" like those in MacKenzie & Guilford, including one with an acute termination. What else might t ... | |
| Topic: Help with mineral identification in thin section from Khibiny, Kola peninsula |
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| Duncan Miller Replies: 6 Views: 549 |
Forum: Minerals and Mineralogy Posted: May 16, 2022 01:49 Subject: Re: Help with mineral identification in thin section from Khibiny, Kola peninsula |
| Daniel - According to MacKenzie & Guilford (1980) 'Atlas of rock-forming minerals in thin section', aenigmatite may appear opaque but the deep brown colour is pleochroic,. So perhaps you can incre ... | |
| Topic: Stories in Stone: A Guide to the Geology of the Western Cape, South Africa - (34) |
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| Duncan Miller Replies: 5 Views: 5485 |
Forum: Featured Columns of FMF Posted: Mar 26, 2022 23:36 Subject: Re: Stories in Stone: A Guide to the Geology of the Western Cape, South Africa - (34) |
| There is an error on page 59 of Stories in Stone. The rock described as rhyolite, in the text and caption to the photograph, actually is a feldspar-rich syenite.
--------------------------------- ... |
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| Topic: Blue chalcedony pseudomorphs from Ysterputs, southern Namibia - (37) |
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| Duncan Miller Replies: 1 Views: 1875 |
Forum: Featured Columns of FMF Posted: Sep 30, 2021 09:59 Subject: Blue chalcedony pseudomorphs from Ysterputs, southern Namibia - (37) |
| This type of 'magazine’ display that we often use in this section does not allow photos to be enlarged by clicking the mouse on them. The solution to enlarge the screen is to use the keys: Ctrl + mous ... | |
| Topic: Blue chalcedony pseudomorphs from Ysterputs, southern Namibia - (37) |
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| Duncan Miller Replies: 1 Views: 1875 |
Forum: Featured Columns of FMF Posted: Sep 30, 2021 09:57 Subject: Blue chalcedony pseudomorphs from Ysterputs, southern Namibia - (37) |
| Blue chalcedony pseudomorphs from Ysterputs, southern Namibia
By Jo Wicht and Duncan Miller Ysterputs farm in southern Namibia is well known for its blue lace agate, a variety of banded chalcedony ... |
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| Topic: Advice needed on how to get started on a potential project. |
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| Duncan Miller Replies: 6 Views: 2255 |
Forum: Off-Topic and Introductions Posted: Aug 04, 2021 11:30 Subject: Re: advice needed on how to get started on a potential project. |
| The folks at the Lapidary Corner: Colored Stones on the GemologyOnline forum may be able to point you in the right direction. Just search for GemologyOnline(dot)com and navigate from there. | |
| Topic: Stories in Stone: A Guide to the Geology of the Western Cape, South Africa - (34) |
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| Duncan Miller Replies: 5 Views: 5485 |
Forum: Featured Columns of FMF Posted: Dec 08, 2020 15:05 Subject: Re: Stories in Stone: A Guide to the Geology of the Western Cape, South Africa - (34) |
| Dear Jordi,
I would like to thank you, and Carlos Rey and Antonio López Cabello, for the work you have put into publishing Stories in Stone on both the Spanish and English FMF message boards. It is ... |
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| Topic: Stories in Stone: A Guide to the Geology of the Western Cape, South Africa - (34) |
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| Duncan Miller Replies: 5 Views: 5485 |
Forum: Featured Columns of FMF Posted: Dec 08, 2020 14:35 Subject: Stories in Stone: A Guide to the Geology of the Western Cape, South Africa - (34) |
| This type of 'magazine’ display that we often use in this section does not allow photos to be enlarged by clicking the mouse on them. The solution to enlarge the screen is to use the keys: Ctrl + mous ... | |
| Topic: Stories in Stone: A Guide to the Geology of the Western Cape, South Africa - (34) |
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| Duncan Miller Replies: 5 Views: 5485 |
Forum: Featured Columns of FMF Posted: Dec 08, 2020 14:33 Subject: Stories in Stone: A Guide to the Geology of the Western Cape, South Africa - (34) |
| At the end of March 2020 South Africa went into an extended ‘hard lockdown’ to try to slow the spread of the COVID-19 virus. This obliged everyone to stay at home, except to buy essential goods or rec ... | |
| Topic: Odd textures on this large beryl |
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| Duncan Miller Replies: 10 Views: 5283 |
Forum: Minerals and Mineralogy Posted: Nov 24, 2020 11:28 Subject: Re: Odd textures on this large beryl |
| I think the rough texture is just natural etching of exposed surfaces, with the smoother faces protected by whatever mineral the crystal was embedded in originally. | |
| Topic: Habit restriction of garnets |
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| Duncan Miller Replies: 13 Views: 9235 |
Forum: Minerals and Mineralogy Posted: Jun 14, 2020 04:10 Subject: Re: Habit restriction of garnets |
| This fairly recent paper isn't about garnets, but it has a potentially useful list of references and gives one some idea of the complexity of research in trying to understand crystal habits. It should ... | |
| Topic: Stay at home - Coronavirus / Covid-19 |
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| Duncan Miller Replies: 364 Views: 171224 |
Forum: National Library of Spain / Biblioteca Nacional de España (BNE) and FMF Posted: Mar 22, 2020 10:00 Subject: Re: Stay at home - Coronavirus / Covid-19 and Internet |
| we publish all kinds of flowering plants (more, please)
This is for Jordi, who evidently likes exotic plants. Autumn In the south western Cape, South Africa is our spring, when plants sense the comin ... |
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| Topic: Taking great photographs |
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| Duncan Miller Replies: 30 Views: 31671 |
Forum: Micros & Macros - Images of Minerals Posted: Feb 25, 2020 14:48 Subject: Re: Taking great photographs |
| Duncan, your pentax should have a manual white balance setting where you can adjust the temperature in kelvins. Try starting at 5-6k and adjust up or down as needed. Might save some time/frustration I ... | |
| Topic: Taking great photographs |
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| Duncan Miller Replies: 30 Views: 31671 |
Forum: Micros & Macros - Images of Minerals Posted: Feb 24, 2020 10:27 Subject: Re: Taking great photographs |
| This was my initial photographic set-up - wine box, tracing paper over cut-outs, Lumix point-and-shoot camera, sunlight outside. You may laugh, but with some computer tweaking the photographs were goo ... | |
| Topic: Smoky Quartz or Smoky Glass? |
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| Duncan Miller Replies: 21 Views: 11557 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Jan 12, 2020 05:32 Subject: Re: Smoky Quartz or Smoky Glass? |
| > Should the monitor screen be white as in a blank page in a browser when I try this?
yes It won't work with one of these cathode ray tube monitors, of course, but everything else should work, ... |
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| Topic: Is this a twin? |
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| Duncan Miller Replies: 28 Views: 53170 |
Forum: The Ten Thousand Club Posted: May 16, 2019 02:17 Subject: Re: Is this a twin? |
| As regards to Dauphene twinning revealed by light etching - it's interesting that when a twin boundary goes around an edge from r to z the etch pattern switches. That's because on one side of the edg ... | |
| Topic: Is this a twin? |
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| Duncan Miller Replies: 28 Views: 53170 |
Forum: The Ten Thousand Club Posted: May 15, 2019 14:47 Subject: Re: Is this a twin? |
| I doubt very much that this is a Brazil law twin. The two faces you propose as x faces are actually s faces. (See Drawing) They look like x faces because they are adjacent to large steep rhombohedral ... | |
| Topic: Is this a twin? |
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| Duncan Miller Replies: 28 Views: 53170 |
Forum: The Ten Thousand Club Posted: May 15, 2019 09:33 Subject: Re: Is this a twin? |
| Hello Pete - Thanks for your very prompt response. The crystal does have natural etching. Here is a photograph showing the opposite prism face. Curvy or straight, or should one use magnification? | |
| Topic: Is this a twin? |
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| Duncan Miller Replies: 28 Views: 53170 |
Forum: The Ten Thousand Club Posted: May 15, 2019 07:31 Subject: Re: Is this a twin? |
| Is this a morphological Brazil-law twin? It appears to have x-faces in both upper corners of the prism face. | |
| Topic: Abrasives repairing polishing crystals |
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| Duncan Miller Replies: 11 Views: 11065 |
Forum: Conserving, Preparing and Cleaning Minerals Posted: Aug 19, 2018 04:02 Subject: Re: Abrasives repairing polishing crystals |
| Anyway to cut it shorter what do you guys use on crystals for chips and a perfect shine as I am struggling at the moment thanks!
Diamond - This isn't really the appropriate forum to ask a question ... |
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