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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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| Search found 372 matches |
| Author | Message |
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 Topic: Help with mineral identification in thin section from Khibiny, Kola peninsula |
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| Pete Modreski Replies: 6 Views: 626 |
 Forum: 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 |
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| Topic: Unknown metallic mineral |
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| Pete Modreski Replies: 12 Views: 1402 |
Forum: 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 |
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| Pete Modreski Replies: 12 Views: 1402 |
Forum: 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 |
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| Pete Modreski Replies: 6 Views: 1227 |
Forum: 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 ... |
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| Topic: Guidance rather than identification |
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| Pete Modreski Replies: 7 Views: 1418 |
Forum: 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 ... |
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| Topic: 15 years since the beginning of FMF. As time goes! |
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| Pete Modreski Replies: 19 Views: 5977 |
Forum: 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 |
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| Pete Modreski Replies: 7 Views: 2135 |
Forum: 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 ... |
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| Topic: Linarite or azurite |
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| Pete Modreski Replies: 5 Views: 5729 |
Forum: 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 |
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| Pete Modreski Replies: 15 Views: 7771 |
Forum: 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 ... |
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| Topic: Opal soil finds |
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| Pete Modreski Replies: 3 Views: 1773 |
Forum: 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 |
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| Pete Modreski Replies: 20 Views: 6486 |
Forum: 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 |
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| Pete Modreski Replies: 10 Views: 4337 |
Forum: 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 |
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| Pete Modreski Replies: 5 Views: 2540 |
Forum: 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 |
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| Pete Modreski Replies: 10 Views: 3998 |
Forum: 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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| Topic: Luxullianite - UK |
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| Pete Modreski Replies: 1 Views: 2427 |
Forum: Minerals and Mineralogy Posted: Jan 03, 2021 10:04 Subject: Re: Luxullianite - UK |
| Very nice! From Cornwall, of course? I once got to attend a conference on granites, in St. Austell. | |
| Topic: What mineral is this????? |
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| Pete Modreski Replies: 9 Views: 4061 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Dec 14, 2020 00:29 Subject: Re: What mineral is this????? |
| Alfredo's fire retardant suggestion like it may be "right on", a very good thought. I would never have thought of this! (I've probably never seen fire retardant that was actually sprayed ... | |
| Topic: Is this still quartz? |
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| Pete Modreski Replies: 10 Views: 4679 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Dec 10, 2020 16:16 Subject: Re: Is this still quartz? |
| This appears to be a quartz-mica schist; the presence of the mica (all the sparkling flakes, of course) would account for the other elements (K, Ca, Mg, Fe, Al) that show up in the X-ray spectrum.
... |
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| Topic: Big rock from Grandpa |
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| Pete Modreski Replies: 7 Views: 3414 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Oct 26, 2020 17:03 Subject: Re: Big rock from Grandpa |
| Yes, you clearly have a large rock nodule, with agate in the center. Being as it's evidently a large heavy rock, it's most likely your grandpa got it from somewhere in your local area, or at least, yo ... | |
| Topic: Does anyone know what this may be?! |
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| Pete Modreski Replies: 3 Views: 22328 |
Forum: What is it? - Where is it from? Posted: Aug 21, 2020 11:05 Subject: Re: Does anyone know what this may be?! |
| I'll agree, that this is most likely pyrite, Aetherian. Likely mixed with quartz (if there's obvious white mineral material with it). If the whole rock is pyrite, it should feel REALLY heavy.
If ... |
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| Topic: Newest Specimen |
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| Pete Modreski Replies: 12 Views: 5608 |
Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Jun 30, 2020 06:54 Subject: Re: Newest Specimen |
| Elena,
That first side of the rock, your first picture, looks very much like granite--exactly like granite. it seems! (Though as was mentioned, gravel derived from decomposed granite, can be very s ... |
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