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05 Jul-05:05:28 Re: the mizunaka collection (Tobi)
04 Jul-20:52:30 Re: don lum collection (Don Lum)
04 Jul-15:41:39 The mizunaka collection - chrysocolla (Am Mizunaka)
04 Jul-11:31:17 Re: collection of michael shaw (Michael Shaw)
04 Jul-08:25:59 Re: the mim museum in beirut, lebanon (Mim Museum)
04 Jul-07:22:13 Re: collection of volkmar stingl (Volkmar Stingl)
04 Jul-04:00:39 Re: new generation for picture - ploum (Tobi)
03 Jul-11:46:17 Re: nature used 57 recipes to create earth's ~10,500+ minerals! (Peter Lemkin)
03 Jul-11:31:17 Nature used 57 recipes to create earth's ~10,500+ minerals! (Peter Lemkin)
03 Jul-09:43:04 Re: collection of michael shaw (Michael Shaw)
03 Jul-06:04:41 Re: new generation for picture - ploum (Ploum)
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)

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  Topic: Help with mineral identification in thin section from Khibiny, Kola peninsula
Pete Modreski

Replies: 6
Views: 626

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: 1402

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: 1402

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: 1227

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: 1418

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: 5977

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: 2135

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: 5729

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: 7771

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: 1773

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: 6486

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: 4337

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: 2540

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: 3998

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 ...
  Topic: Luxullianite - UK
Pete Modreski

Replies: 1
Views: 2427

PostForum: 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?????
Pete Modreski

Replies: 9
Views: 4061

PostForum: 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?
Pete Modreski

Replies: 10
Views: 4679

PostForum: 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.

...
  Topic: Big rock from Grandpa
Pete Modreski

Replies: 7
Views: 3414

PostForum: 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?!
Pete Modreski

Replies: 3
Views: 22328

PostForum: 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 ...
  Topic: Newest Specimen
Pete Modreski

Replies: 12
Views: 5608

PostForum: 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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