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Newest topics and users posts
14 May-23:17:51 The mizunaka collection - villiaumite (Am Mizunaka)
14 May-19:36:49 Re: is this still quartz?? (Steveb)
14 May-13:16:33 Re: is this still quartz?? (Amir Akhavan)
14 May-05:39:32 Re: is this still quartz?? (Alfredo)
14 May-04:42:01 Re: collection of firmo espinar (Firmo Espinar)
14 May-04:01:54 Re: is this still quartz?? (James Catmur)
14 May-04:00:56 Re: collection of shawn spink (Shawn S)
14 May-03:56:12 Re: collection of shawn spink (James Catmur)
14 May-01:10:03 Re: collection of shawn spink (Jordi Fabre)
14 May-00:59:12 Re: collection of shawn spink (Fmf Forum)
13 May-22:19:30 Is this still quartz?? (Ken)
13 May-18:15:30 Re: collection of shawn spink (Bob Carnein)
13 May-18:12:35 Re: collection of shawn spink (Shawn S)
13 May-18:00:35 Re: collection of shawn spink (Shawn S)
13 May-17:51:04 Re: collection of shawn spink (Shawn S)
13 May-17:24:34 Re: collection of shawn spink (Shawn S)
13 May-17:20:26 Re: collection of shawn spink (Shawn S)
13 May-17:08:43 Re: collection of shawn spink (Alfredo)
13 May-17:00:58 Re: collection of shawn spink (Shawn S)
13 May-16:49:28 Re: collection of shawn spink (Bob Harman)
13 May-16:37:43 Re: collection of shawn spink (Shawn S)
13 May-15:49:35 Re: collection of shawn spink (Bob Harman)
13 May-13:44:53 Collection of shawn spink (Shawn S)
13 May-13:14:37 Re: morocco, light, shape and colour - (36) (Fmf Forum)
13 May-13:12:55 Morocco, light, shape and colour - (36) (Fmf Forum)

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

Replies: 4
Views: 2729

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: 4
Views: 2729

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: 4
Views: 2729

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: 3124

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: 6284

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: 345
Views: 102284

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: 25127

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: 25127

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: 7941

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: 45224

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: 45224

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: 45224

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: 45224

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: 8830

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 ...
  Topic: Hematite twins (article in Rocks & Minerals Jan/Feb 2018)
Duncan Miller

Replies: 4
Views: 20720

PostForum: Rocks & Minerals   Posted: May 26, 2018 01:35   Subject: Re: Hematite twins (article in Rocks & Minerals Jan/Feb 2018)
Hello Pete
Thank you for your clarifiication (and correction), and the new diagram that illustrates the twinning very clearly.
So that others may see where the problem lay, my confusion arose from t ...
  Topic: Hematite twins (article in Rocks & Minerals Jan/Feb 2018)
Duncan Miller

Replies: 4
Views: 20720

PostForum: Rocks & Minerals   Posted: May 14, 2018 04:15   Subject: Re: Hematite twins (article in Rocks & Minerals Jan/Feb 2018)
Hello Pete

Thanks for responding and your clarification. The inverted triangles are what got me thinking of rotation about [010] = mirror on {001} (which at first I could not visualise at all), but ...
  Topic: Hematite twins (article in Rocks & Minerals Jan/Feb 2018)
Duncan Miller

Replies: 4
Views: 20720

PostForum: Rocks & Minerals   Posted: May 06, 2018 01:11   Subject: Hematite twins (article in Rocks & Minerals Jan/Feb 2018)
This is a question for Peter Richards. I have been reading your beautifully illustrated article with Mirjan Žorž (in Rocks & Minerals Jan/Feb 2018) about hematite twins from the Kalahari Manganese ...
  Topic: Minerals sans life
Duncan Miller

Replies: 15
Views: 12030

PostForum: Minerals and Mineralogy   Posted: Dec 13, 2017 00:22   Subject: Re: Minerals sans life
...it is idiotic to reason that the complex life on earth was the result of the advent of simple microscopic organisms that evolved into a hugely complex system that is the earth.Pierre, it is uncivil ...
  Topic: Could this be a very rare limestone shatter cone from the UK?
Duncan Miller

Replies: 18
Views: 17443

PostForum: Minerals and Mineralogy   Posted: May 13, 2016 01:27   Subject: Re: Could this be a very rare limestone shatter cone from the UK?
James, the reddish-brown (or brownish-red) streak you obtained is quite common for hematite. I don't see any scratch on the knife blade or file. When you have done a scratch test, rub the 'scratch' wi ...
  Topic: I need everyone's opinion on this specimen I found.
Duncan Miller

Replies: 10
Views: 10643

PostForum: Minerals and Mineralogy   Posted: Feb 21, 2016 04:38   Subject: Re: I need everyone's opinion on this specimen I found.
No, I have seen PLENTY of slag. And that's not slag. Even the Geologist said that he saw fusion. Slag does not produce fusion. And I have seen plenty of melted glass too. But none of that melted glass ...
 
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