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24 Jun-08:35:32 Re: gold? (Kevin Schofield)
24 Jun-06:28:25 Re: collection of firmo espinar (Firmo Espinar)
24 Jun-06:20:27 Re: gold? (Firmo Espinar)
23 Jun-22:54:25 Sainte-marie-aux-mines 2022 - first official day (Jordi Fabre)
23 Jun-21:05:36 Gold? (Duane01)
23 Jun-18:57:56 Re: collection of michael shaw (Michael Shaw)
23 Jun-15:10:26 Re: collection of michael shaw (Silvia)
23 Jun-12:22:16 Re: collection of volkmar stingl (Volkmar Stingl)
23 Jun-09:39:11 Re: collection of michael shaw (Michael Shaw)
22 Jun-17:40:56 The mizunaka collection - quartz (Am Mizunaka)
22 Jun-15:48:39 Romania - silvia's collection (Silvia)
22 Jun-13:14:20 Re: please help id, maybe pyrite? (Dirk Black)
22 Jun-13:12:02 Re: please help id, maybe pyrite? (Vic Rzonca)
22 Jun-13:10:48 Re: please help id, maybe pyrite? (Dirk Black)
22 Jun-13:09:16 Re: please help id, maybe pyrite? (Peter Megaw)
22 Jun-13:02:57 Please help id, maybe pyrite? (Dirk Black)
22 Jun-02:39:18 Re: sainte-marie-aux-mines 2022 - day one (Marticv)
22 Jun-02:36:16 Re: sainte-marie-aux-mines 2022 - the reunion (Marticv)
22 Jun-02:33:44 Re: sainte-marie-aux-mines 2022 - the reunion (Marticv)
21 Jun-15:09:34 Re: the mizunaka collection- ottens china ii book plus updated image (Am Mizunaka)
21 Jun-13:46:37 Re: collection of volkmar stingl (Volkmar Stingl)
21 Jun-06:08:06 Re: collection of volkmar stingl (Tobi)
21 Jun-04:56:35 Re: the mizunaka collection- ottens china ii book plus updated image (Tobi)
21 Jun-02:42:00 Re: sainte-marie-aux-mines 2022 - getting back together (Marticv)
21 Jun-00:14:17 Re: the mizunaka collection- ottens china ii book plus updated image (Am Mizunaka)

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  Topic: Help with mineral identification in thin section from Khibiny, Kola peninsula
Duncan Miller

Replies: 6
Views: 549

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: 549

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: 5485

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: 1875

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: 1875

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: 2255

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: 5485

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: 5485

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: 5485

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: 5283

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: 9235

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: 171224

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: 31671

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: 31671

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 ...
  Topic: Smoky Quartz or Smoky Glass?
Duncan Miller

Replies: 21
Views: 11557

PostForum: 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, ...
  Topic: Is this a twin?
Duncan Miller

Replies: 28
Views: 53170

PostForum: 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?
Duncan Miller

Replies: 28
Views: 53170

PostForum: 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?
Duncan Miller

Replies: 28
Views: 53170

PostForum: 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?
Duncan Miller

Replies: 28
Views: 53170

PostForum: 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
Duncan Miller

Replies: 11
Views: 11065

PostForum: 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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