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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 47 matches |
| Author | Message |
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 Topic: About cyclic twinning - (5) |
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| Peter Farquhar Replies: 157 Views: 278285 |
 Forum: Featured Columns of FMF Posted: Sep 08, 2023 09:38 Subject: Re: About cyclic twinning - (5) |
| Rutile eightlings are found in several localities worldwide, but they are somewhat rare from Graves Mountain. Below is a photo of an unusual rutile eightling (PF-3645 ) on matrix from Graves Mountain ... | |
| Topic: About cyclic twinning - (5) |
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| Peter Farquhar Replies: 157 Views: 278285 |
Forum: Featured Columns of FMF Posted: Aug 29, 2023 14:31 Subject: Re: About cyclic twinning - (5) |
| Based upon the helpful feedback, I carefully examined the top of the rutile specimen again. This time I experimented with different lighting sources, temperatures, and angles; polarizing filters; and ... | |
| Topic: About cyclic twinning - (5) |
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| Peter Farquhar Replies: 157 Views: 278285 |
Forum: Featured Columns of FMF Posted: Aug 26, 2023 13:41 Subject: Re: About cyclic twinning - (5) |
| The rutile specimen below (PF-3651) is from Graves Mountain, Georgia, and was once in Rock Currier's collection #3085. This rutile is quite unusual, because it has six sides yet no central cavity. ... | |
| Topic: About cyclic twinning - (5) |
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| Peter Farquhar Replies: 157 Views: 278285 |
Forum: Featured Columns of FMF Posted: Aug 25, 2023 09:49 Subject: Re: About cyclic twinning - (5) |
| One of the best features of FMF is having experts like Pete Richards and Mark Mauthner sharing their insights. I am very grateful for their help with this research.
Pete Richards makes important ... |
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| Topic: About cyclic twinning - (5) |
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| Peter Farquhar Replies: 157 Views: 278285 |
Forum: Featured Columns of FMF Posted: Aug 18, 2023 12:56 Subject: Re: About cyclic twinning - (5) |
| Eleven years ago today, on August 18, 2012, Tracy Kimmel initiated this FMF thread with a question "About Cyclic Twinning." Since then, this thread has garnered more than a quarter million ... | |
| Topic: In Memoriam - Tracy has left us |
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| Peter Farquhar Replies: 8 Views: 12669 |
Forum: 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 |
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| Peter Farquhar Replies: 15 Views: 10919 |
Forum: 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 |
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| Peter Farquhar Replies: 15 Views: 10919 |
Forum: 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 |
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| Peter Farquhar Replies: 15 Views: 10919 |
Forum: 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 ... |
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| Topic: Proposed new system for classifying minerals |
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| Peter Farquhar Replies: 15 Views: 10919 |
Forum: 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 ... |
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| Topic: Rutile locality? |
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| Peter Farquhar Replies: 18 Views: 14869 |
Forum: 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? |
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| Peter Farquhar Replies: 18 Views: 14869 |
Forum: 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 ... |
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| Topic: Very steep rhombohedral calcite? |
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| Peter Farquhar Replies: 14 Views: 13247 |
Forum: 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 ... |
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| Topic: James Sowerby's illustrations |
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| Peter Farquhar Replies: 2 Views: 6287 |
Forum: 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) |
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| Peter Farquhar Replies: 157 Views: 278285 |
Forum: 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 |
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| Peter Farquhar Replies: 6 Views: 5637 |
Forum: 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 ... |
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| Topic: About cyclic twinning - (5) |
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| Peter Farquhar Replies: 157 Views: 278285 |
Forum: 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) |
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| Peter Farquhar Replies: 157 Views: 278285 |
Forum: 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) |
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| Peter Farquhar Replies: 157 Views: 278285 |
Forum: 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) |
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| Peter Farquhar Replies: 157 Views: 278285 |
Forum: 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 ... |
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