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Newest topics and users posts
02 Jul-14:58:25 The mizunaka collection - calcite with pyrite (Am Mizunaka)
02 Jul-14:44:48 Sainte-marie-aux-mines 2022 - the new discoveries (1) (Jordi Fabre)
01 Jul-16:16:08 Re: pyromorphite and ...? (Colin Robinson)
01 Jul-13:56:47 Re: twinned topaz? (John S. White)
01 Jul-12:20:34 Re: pyromorphite and ...? (Forrestblyth)
01 Jul-11:34:01 Re: caldbeck cumbria mineral (Forrestblyth)
01 Jul-11:25:31 Re: pyromorphite and ...? (Forrestblyth)
01 Jul-10:32:27 Re: twinned topaz? (Bob Carnein)
01 Jul-10:17:29 Re: collection of volkmar stingl (Volkmar Stingl)
01 Jul-10:15:24 Re: twinned topaz? (Yannick Cosson)
01 Jul-08:51:24 Re: twinned topaz? (Pete Richards)
01 Jul-07:43:29 Re: twinned topaz? (Josele)
01 Jul-06:38:46 Re: twinned topaz? (Bob Morgan)
01 Jul-05:07:43 Twinned topaz? (Yannick Cosson)
30 Jun-23:13:16 The mizunaka collection - fluorite (Am Mizunaka)
30 Jun-16:35:12 Re: pyromorphite and ...? (Colin Robinson)
30 Jun-16:29:27 Re: collection of firmo espinar (Firmo Espinar)
30 Jun-16:27:07 Re: linarite (Colin Robinson)
30 Jun-16:18:29 Re: barytocalcite (Colin Robinson)
30 Jun-14:20:08 Re: spherical inclusions in amethyst - cristobalite? vs fluorite (Roger Warin)
30 Jun-14:06:03 Re: spherical inclusions in amethyst - cristobalite? vs fluorite (Amir Akhavan)
30 Jun-08:05:23 Baryte (Forrestblyth)
30 Jun-07:58:42 Barytocalcite (Forrestblyth)
30 Jun-07:50:45 Re: caldbeck cumbria mineral (Kevin Schofield)
30 Jun-07:49:05 Baryte (Forrestblyth)

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  Topic: In Memoriam - Tracy has left us
Peter Farquhar

Replies: 8
Views: 2791

PostForum: In Memoriam   Posted: Nov 09, 2021 16:29   Subject: Re: In Memoriam - Tracy has left us
In her postscripts, Tracy always quoted Socrates, "Wisdom begins in wonder." She exemplified Socratic teaching by often asking fundamental questions that left many of us wondering how best ...
  Topic: Proposed new system for classifying minerals
Peter Farquhar

Replies: 15
Views: 7034

PostForum: Minerals and Mineralogy   Posted: Jan 06, 2021 19:38   Subject: Re: Proposed new system for classifying minerals
One of the most interesting mineralogy texts I have read is by George Robinson. It is interesting because it organizes minerals in terms of their environments and processes of formation, not their ch ...
  Topic: Proposed new system for classifying minerals
Peter Farquhar

Replies: 15
Views: 7034

PostForum: Minerals and Mineralogy   Posted: Jan 01, 2021 12:19   Subject: Re: Proposed new system for classifying minerals
Thanks Pete for reminding us about Robert Hazen's presentation at the 2017 Dallas Mineral Collecting Symposium. For those interested in "social network analysis applied to mineral discovery" ...
  Topic: Proposed new system for classifying minerals
Peter Farquhar

Replies: 15
Views: 7034

PostForum: Minerals and Mineralogy   Posted: Dec 31, 2020 17:38   Subject: Re: Proposed new system for classifying minerals
On December 22, 2020, John Stolz started a thread on Mindat entitled "Call for IMA to classify minerals using an 'evolutionary system'"
( https://zh.mindat.org/mesg-546207.html ). The Mind ...
  Topic: Proposed new system for classifying minerals
Peter Farquhar

Replies: 15
Views: 7034

PostForum: Minerals and Mineralogy   Posted: Dec 28, 2020 12:30   Subject: Re: Proposed new system for classifying minerals
Thanks Don for this link -- a very interesting article to read. I'm aware of related research on the increasingly important role of trace elements and impurities in analyzing minerals.

I wonder ...
  Topic: Rutile locality?
Peter Farquhar

Replies: 18
Views: 8511

PostForum: Mines and Mineral Localities   Posted: Dec 20, 2020 17:09   Subject: Re: Rutile locality?
In a moment, I'll explain why Pete Richards' rutile specimen is likely from the Blumberg rutile deposits about 40 km ENE of Adelaide in South Australia, Australia. This old rutile site from the late ...
  Topic: Rutile locality?
Peter Farquhar

Replies: 18
Views: 8511

PostForum: Mines and Mineral Localities   Posted: Dec 17, 2020 19:47   Subject: Re: Rutile locality?
If RutileFox does not know then who would?
He has the best rutile collection I am aware of...

My thanks to Pete Richards for posting this challenge, and to John Betts for his call to action. Aft ...
  Topic: Very steep rhombohedral calcite?
Peter Farquhar

Replies: 14
Views: 7229

PostForum: Minerals and Mineralogy   Posted: Oct 19, 2020 12:39   Subject: Re: Very steep rhombohedral calcite?
What an informative thread! Thanks to Josele, Amir, James, John, Bob, and Pete for taking the time to prepare such thoughtful replies to such interesting questions.

Your efforts are widely appre ...
  Topic: James Sowerby's illustrations
Peter Farquhar

Replies: 2
Views: 4581

PostForum: Mineralogical Literature   Posted: Aug 14, 2020 13:29   Subject: Re: James Sowerby's illustrations
Thanks to James for this link. It's an incredible resource!
  Topic: About cyclic twinning - (5)
Peter Farquhar

Replies: 144
Views: 224080

PostForum: Featured Columns of FMF   Posted: Aug 14, 2020 08:58   Subject: Re: About cyclic twinning - (5)
However, I disagree with the conclusion that the specimens that you’ve pictured and described are rutile sixling paramorphs of brookite. I believe they are indeed rutile paramorphs of brookite. J ...
  Topic: New Administrator - Peter Farquhar
Peter Farquhar

Replies: 6
Views: 4020

PostForum: Off-Topic and Introductions   Posted: Aug 10, 2020 12:58   Subject: New Administrator - Peter Farquhar
The Friends of Minerals Forum started 14 years ago on August 7, 2006. Let me wish Jordi Fabre and all the other moderators, administrators, and workers at FMF a very Happy Anniversary!!

Thanks t ...
  Topic: About cyclic twinning - (5)
Peter Farquhar

Replies: 144
Views: 224080

PostForum: Featured Columns of FMF   Posted: Aug 05, 2020 14:11   Subject: Re: About cyclic twinning - (5)
After a long sabbatical, I’m ready to continue the discussion on cyclic twinning. Let me begin by thanking Pete Richards for his detailed reply in 2015 to my post two years earlier about twinning in ...
  Topic: About cyclic twinning - (5)
Peter Farquhar

Replies: 144
Views: 224080

PostForum: Featured Columns of FMF   Posted: Oct 26, 2013 19:31   Subject: Re: About cyclic twinning - (5)
Several contributors to this thread have explained why cyclic-twinned rutile specimens cannot form closed hexagonal loops with six equal sides. Because of their tetragonal structure, cyclic twinned r ...
  Topic: About cyclic twinning - (5)
Peter Farquhar

Replies: 144
Views: 224080

PostForum: Featured Columns of FMF   Posted: Sep 08, 2013 16:19   Subject: Re: About cyclic twinning - (5)
Thus my question derives from the lack of a satisfactory Spanish synonym for 'sixling'. When I translated this thread into Spanish FMF I used the construction 'macla séxtuple' (something like 'sixfol ...
  Topic: About cyclic twinning - (5)
Peter Farquhar

Replies: 144
Views: 224080

PostForum: Featured Columns of FMF   Posted: Sep 06, 2013 17:43   Subject: Re: About cyclic twinning - (5)
Hi, Peter. Another outstanding ruitle! I would like to ask you why you call it 'a sixling'.

In answering your question, I researched the etymology of the term “sixling” and its early uses for cy ...
  Topic: About cyclic twinning - (5)
Peter Farquhar

Replies: 144
Views: 224080

PostForum: Featured Columns of FMF   Posted: Sep 03, 2013 18:11   Subject: Re: About cyclic twinning - (5)
Many collectors are familiar with the distinctive rutile sixlings labeled from Parkesburg, Pennsylvania. These cyclic twinned rutile specimens were usually found in loose soil along a 30-mile valley ...
  Topic: About cyclic twinning - (5)
Peter Farquhar

Replies: 144
Views: 224080

PostForum: Featured Columns of FMF   Posted: Jul 23, 2013 16:46   Subject: Re: About cyclic twinning - (5)
Identical twins

On this thread in August 2012, I posted a photographic plate from Louis Pope Gratacap’s famous 1912 book, “A Popular Guide to Minerals.” The 1907 plate showed three Parkesburg, Pen ...
  Topic: Spinel twins
Peter Farquhar

Replies: 54
Views: 94715

PostForum: Minerals and Mineralogy   Posted: Jul 02, 2013 14:31   Subject: Re: Spinel twins
What a great idea for learning about twinning while enjoying a pleasant snack. The opportunities seem endless. Do you recommend any particular cheese?
  Topic: About cyclic twinning - (5)
Peter Farquhar

Replies: 144
Views: 224080

PostForum: Featured Columns of FMF   Posted: Jun 24, 2013 09:02   Subject: Re: About cyclic twinning - (5)
The Spanish Forum has a new thread on Maclas ("Twinning") that is superb. Pep Gorgas started the thread, and it has grown significantly with original explanations to some of the difficult qu ...
  Topic: About cyclic twinning - (5)
Peter Farquhar

Replies: 144
Views: 224080

PostForum: Featured Columns of FMF   Posted: May 16, 2013 17:49   Subject: Re: About cyclic twinning - (5)
Let me add some new information about the provenance of the cyclic twinned rutile (PF-3405) from Horcajuelo de la Sierra, Madrid, Spain that I posted on January 31, 2013. Miguel Calvo is correct -- th ...
 
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