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02 Jul-09:29:48 Re: libyan desert glass structure (Craig Hagstrom)
02 Jul-09:12:17 Re: libyan desert glass structure (Marco Campos-venuti)
02 Jul-09:02:38 Re: libyan desert glass structure (Craig Hagstrom)
02 Jul-08:49:56 Re: libyan desert glass structure (Marco Campos-venuti)
02 Jul-06:09:25 Re: libyan desert glass structure (James Catmur)
01 Jul-14:47:07 Re: libyan desert glass structure (Alfredo)
01 Jul-09:55:00 Re: libyan desert glass structure (Craig Hagstrom)
01 Jul-05:05:41 Re: libyan desert glass structure (Roger Warin)
01 Jul-01:07:57 The mizunaka collection - elbaite (Am Mizunaka)
30 Jun-21:33:59 Re: some rare phosphates from the democratic republic of congo and zimbabwe (Roger Warin)
30 Jun-14:52:04 Re: libyan desert glass structure (Craig Hagstrom)
30 Jun-14:39:38 Re: libyan desert glass structure (Marco Campos-venuti)
30 Jun-13:55:05 Re: tourmaline namibia? (Izak)
30 Jun-13:07:14 Re: libyan desert glass structure (Craig Hagstrom)
30 Jun-12:24:05 Re: libyan desert glass structure (Marco Campos-venuti)
30 Jun-12:07:00 Re: gwindel skutterudite? (Marco Campos-venuti)
30 Jun-11:52:28 Re: libyan desert glass structure (Craig Hagstrom)
30 Jun-08:17:07 Re: collection of michael shaw (Michael Shaw)
30 Jun-07:28:28 Re: the mim museum in beirut, lebanon (Mim Museum)
30 Jun-03:02:46 Re: some rare phosphates from the democratic republic of congo and zimbabwe (Knut Eldjarn)
29 Jun-18:12:45 Azurite (Silvia)
29 Jun-16:45:52 Sainte-marie-aux-mines 2025 - chalcopyrite and stannite on ferberite (Jordi Fabre)
29 Jun-16:43:42 Some rare phosphates from the democratic republic of congo and zimbabwe (Roger Warin)
29 Jun-13:59:02 Re: gwindel skutterudite? (Pete Richards)
29 Jun-12:07:28 Re: sainte-marie-aux-mines 2025 - media (Carles)

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  Topic: Quartz confusion
Duncan Miller

Replies: 2
Views: 4912

PostForum: What is it? - Where is it from?   Posted: Jun 28, 2022 03:13   Subject: Re: Quartz confusion
Hi Nirvash

You could join the Natal Gem & Mineral Society to learn more about the local rocks and minerals, including those around Josini. Contact: Renee Hadfield natalmineralandgemsociety @ gm ...
  Topic: Help with mineral identification in thin section from Khibiny, Kola peninsula
Duncan Miller

Replies: 6
Views: 7632

PostForum: 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
Duncan Miller

Replies: 6
Views: 7632

PostForum: 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)
Duncan Miller

Replies: 5
Views: 17875

PostForum: 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.


--------------------------------- ...
  Topic: Blue chalcedony pseudomorphs from Ysterputs, southern Namibia - (37)
Duncan Miller

Replies: 1
Views: 15357

PostForum: 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)
Duncan Miller

Replies: 1
Views: 15357

PostForum: 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 ...
  Topic: Advice needed on how to get started on a potential project.
Duncan Miller

Replies: 6
Views: 6156

PostForum: 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)
Duncan Miller

Replies: 5
Views: 17875

PostForum: 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 ...
  Topic: Stories in Stone: A Guide to the Geology of the Western Cape, South Africa - (34)
Duncan Miller

Replies: 5
Views: 17875

PostForum: 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)
Duncan Miller

Replies: 5
Views: 17875

PostForum: 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
Duncan Miller

Replies: 10
Views: 12456

PostForum: 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
Duncan Miller

Replies: 13
Views: 23694

PostForum: 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
Duncan Miller

Replies: 364
Views: 468071

PostForum: 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 ...
  Topic: Taking great photographs
Duncan Miller

Replies: 30
Views: 63689

PostForum: 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
Duncan Miller

Replies: 30
Views: 63689

PostForum: 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 ...
 
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