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21 Jun-02:48:48 Re: 2024 nanjing mineral show (cimge) - video show report - 60+ videos (James Catmur)
20 Jun-20:56:26 Friday posts - 2024 nanjing mineral show (cimge) - video show report - 60+ videos (Bluecapproductions)
20 Jun-17:43:36 Re: 2024 nanjing mineral show (cimge) - video show report - 60+ videos (Bluecapproductions)
20 Jun-16:24:50 Re: is malachite rare? (Linus)
20 Jun-15:09:22 Re: collection of michael shaw (Michael Shaw)
20 Jun-15:07:56 Re: is malachite rare? (Alfredo)
20 Jun-12:53:27 Re: inclusion of pezzotaite in quartz (William Gardner)
20 Jun-10:33:16 Re: the first museums and early mineral collections (by david carter) (James Catmur)
20 Jun-10:32:17 Re: inclusion of pezzotaite in quartz (James Catmur)
20 Jun-10:30:36 Re: is malachite rare? (James Catmur)
20 Jun-08:12:11 Re: 2024 nanjing mineral show (cimge) - video show report - 60+ videos (James Catmur)
20 Jun-03:58:24 Re: collection of volkmar stingl (Volkmar Stingl)
20 Jun-01:57:09 Re: 2024 nanjing mineral show (cimge) - video show report - 60+ videos (Bluecapproductions)
20 Jun-01:56:30 Re: 2024 nanjing mineral show (cimge) - video show report - 60+ videos (Bluecapproductions)
20 Jun-01:55:50 Re: 2024 nanjing mineral show (cimge) - video show report - 60+ videos (Bluecapproductions)
20 Jun-01:54:58 Re: 2024 nanjing mineral show (cimge) - video show report - 60+ videos (Bluecapproductions)
20 Jun-01:54:08 Re: 2024 nanjing mineral show (cimge) - video show report - 60+ videos (Bluecapproductions)
20 Jun-01:53:11 Re: 2024 nanjing mineral show (cimge) - video show report - 60+ videos (Bluecapproductions)
19 Jun-18:34:55 Re: sainte-marie-aux-mines 2024 (Bluecapproductions)
19 Jun-18:32:49 2024 sainte-marie-aux-mines show - live (Bluecapproductions)
19 Jun-18:26:04 Re: 2024 nanjing mineral show (cimge) - video show report - 60+ videos (Bluecapproductions)
19 Jun-18:25:24 Re: 2024 nanjing mineral show (cimge) - video show report - 60+ videos (Bluecapproductions)
19 Jun-18:24:50 Re: 2024 nanjing mineral show (cimge) - video show report - 60+ videos (Bluecapproductions)
19 Jun-18:24:09 Re: 2024 nanjing mineral show (cimge) - video show report - 60+ videos (Bluecapproductions)
19 Jun-18:23:34 Re: 2024 nanjing mineral show (cimge) - video show report - 60+ videos (Bluecapproductions)

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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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Author Message
  Topic: Oxidation of Copper, Lead, and Zinc sulfides and transport below the surface
Pete Modreski

Replies: 4
Views: 6145

PostForum: Minerals and Mineralogy   Posted: Jan 04, 2023 15:22   Subject: Re: Oxidation of Copper, Lead, and Zinc sulfides and transport below the surface
Ray, as I think you do understand, entire volumes have been written about the nature and details of this process of secondary enrichment in ore deposits. I don't think there is any simple answer(s) t ...
  Topic: Pebbles from Elba, containing... tourmaline?
Pete Modreski

Replies: 4
Views: 9781

PostForum: What is it? - Where is it from?   Posted: Nov 16, 2022 10:53   Subject: Re: Pebbles from Elba, containing... tourmaline?
A wonderful reply, Marco, thank you very much! I had guessed that someone on the forum would be familiar with these and know just what they were. Yes, that one pebble with the white veins cutting the ...
  Topic: Pebbles from Elba, containing... tourmaline?
Pete Modreski

Replies: 4
Views: 9781

PostForum: What is it? - Where is it from?   Posted: Nov 16, 2022 00:51   Subject: Pebbles from Elba, containing... tourmaline?
I'd like to try to get the advice of some of my knowledgeable international friends here, to comment on just what these pebbles are, that the sister of a friend of mine, brought back from a trip to El ...
  Topic: Locality for a Väyrynenite?
Pete Modreski

Replies: 13
Views: 23682

PostForum: Improving the FMF Data Base of localities   Posted: Oct 21, 2022 08:25   Subject: Re: Locality for a Väyrynenite?
I am just impressed that there are that many of you who know what Väyrynenite is at all--I had to look it up! Or who can say something like "Whenever I see a Väyrynenite from Pakistan..." .. ...
  Topic: Warty-looking rock. Eroded garnet schist, or...?
Pete Modreski

Replies: 7
Views: 5351

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Sep 15, 2022 13:49   Subject: Re: Warty-looking rock. Eroded garnet schist, or...?
This illustrates the difficulty in identifying or recognizing what's in a rock, just from photos!

When you examine your rock close up--if the matrix looks like uniform, sandy particles, that it pro ...
  Topic: Asbestos name change
Pete Modreski

Replies: 15
Views: 40140

PostForum: Improving the FMF Data Base of localities   Posted: Aug 03, 2022 10:48   Subject: Re: Asbestos name change
And for those of us not from Quebec or elsewhere in Canada, what in the world does RCM stand for? (Thank you, please!)
  Topic: Help with mineral identification in thin section from Khibiny, Kola peninsula
Pete Modreski

Replies: 6
Views: 5001

PostForum: Minerals and Mineralogy   Posted: May 14, 2022 12:47   Subject: Re: Help with mineral identification in thin section from Khibiny, Kola peninsula
Hi Daniel, seems that only one picture made it attached?

I've been there and like these kinds of rocks, but probably don't know enough to offer a sure guess or confirmation tho!

Pete
  Topic: Unknown metallic mineral
Pete Modreski

Replies: 12
Views: 6665

PostForum: What is it? - Where is it from?   Posted: Mar 16, 2022 11:32   Subject: Re: Unknown metallic mineral
Viewing your pictures again--considering the intergrown rutile--yes, I agree with what's been suggested, for sure, hematite with rutile, from Brazil.
  Topic: Unknown metallic mineral
Pete Modreski

Replies: 12
Views: 6665

PostForum: What is it? - Where is it from?   Posted: Mar 16, 2022 10:56   Subject: Re: Unknown metallic mineral
When two minerals are both quite hard and are of comparable hardness, it can be quite difficult to do a reliable hardness scratch test; it sounds like both it and quartz are "near 7" in hard ...
  Topic: Help identify strange rock sample
Pete Modreski

Replies: 6
Views: 4110

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Feb 21, 2022 14:05   Subject: Re: Help identify strange rock sample
'Tis glass, alas!


Some intentionally produced glass for decorative use, or industrial slag glass, may have unmelted chunks of limestone or quartzite or flint in it, that haven't all dissolved in ...
  Topic: Guidance rather than identification
Pete Modreski

Replies: 7
Views: 4269

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Jan 01, 2022 02:40   Subject: Re: Guidance rather than identification
I believe you've studied the specimen well and done the tests correctly, Angel, congratulations! Your concluded answer is what I would have said from your descriptions.

I had been writing a longer ...
  Topic: 15 years since the beginning of FMF. As time goes!
Pete Modreski

Replies: 19
Views: 16143

PostForum: Comments & Suggestions   Posted: Aug 07, 2021 16:22   Subject: Re: 15 years since the beginning of FMF. As time goes!
It has been a most enjoyable and useful Forum and 15 years, Jordi, thank you for the idea and for doing it! And I've met many fine people through it.
  Topic: Crystal Habit of this Pyrite Mineral
Pete Modreski

Replies: 7
Views: 4936

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Aug 05, 2021 12:34   Subject: Re: Crystal Habit of this Pyrite Mineral
Yes, definitely, we'd just call it "massive".

Looks like it's criss-crossed by veins & patches of some other, dark mineral, probably some other sulfide. Could be any of a great numbe ...
  Topic: Linarite or azurite
Pete Modreski

Replies: 5
Views: 21243

PostForum: Conserving, Preparing and Cleaning Minerals   Posted: Jul 12, 2021 13:46   Subject: Re: Linarite or azurite
If it's in vugs associated with galena & anglesite, I would guess it's most likely linarite. Let us know what your acid test turns out to show?
  Topic: Aura Coating
Pete Modreski

Replies: 15
Views: 26674

PostForum: Incorrect classification and fakes   Posted: May 28, 2021 12:11   Subject: Re: Aura Coating
Dear Alea,

As our list moderator James Catmur explained, this site, this Forum, though our title does not clearly explain this, is really aimed at mineral collectors who want to share information a ...
  Topic: Opal soil finds
Pete Modreski

Replies: 3
Views: 3337

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Apr 22, 2021 11:41   Subject: Re: Opal soil finds
Peter Megaw's comments should be very helpful to you, about it appearing to be some form of (something-replaced-by) silica, with a fibrous structure. It simply being petrified (silicified) wood is a ...
  Topic: Soon 15 years of FMF and how to achieve many more
Pete Modreski

Replies: 20
Views: 13832

PostForum: Comments & Suggestions   Posted: Apr 21, 2021 17:54   Subject: Re: Soon 15 years of FMF and how to achieve many more
Thank you, Jordi, for creating and sponsoring the Forum! It has always been a source of much information and interesting reading (and viewing), and your past work, and the new sponsorship, are all ve ...
  Topic: Rescuing massive 13 lb tremolite/actinolite
Pete Modreski

Replies: 10
Views: 19726

PostForum: Conserving, Preparing and Cleaning Minerals   Posted: Apr 14, 2021 10:12   Subject: Re: Rescuing massive 13 lb tremolite/actinolite
Charly, some rocks are just dirty and weathered enough, and have enough insoluble mineral crusts on them, that they are either just impossible to clean, or would require such repeated and "exotic ...
  Topic: Please help id this olive green rock
Pete Modreski

Replies: 5
Views: 4958

PostForum: What is it? - Where is it from?   Posted: Feb 20, 2021 18:17   Subject: Re: Please help id this olive green rock
Cornel, I quite agree with Kevin, about this being most likely a piece of some kind of furnace slag; for all the reasons that he states. But my compliments, too, for your doing such a good job of des ...
  Topic: Help identifying unique rock
Pete Modreski

Replies: 10
Views: 6902

PostForum: What is it? - Where is it from?   Posted: Jan 04, 2021 10:17   Subject: Re: Help identifying unique rock
That is all very good advice about your rock that you received from Pete Megaw.

Likewise, Pete Richards' suggestion is good--I also thought that its shape "might" suggest some kind of fo ...
 
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