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Newest topics and users posts
27 Oct-23:47:31 Re: collection of volkmar stingl (Volkmar Stingl)
27 Oct-15:12:24 Re: fluorite panasqueira style - silvia's collection (Silvia)
27 Oct-13:56:31 Re: collection of fiebre verde (muzo #815) (Fiebre Verde)
27 Oct-10:58:59 Re: old lead ingots with mine of our lady of montserrat (James Catmur)
27 Oct-09:36:47 Re: clinoclase, boleo, baja california, mexico ? (Jesse Fisher)
27 Oct-08:51:35 Re: clinoclase, boleo, baja california, mexico ? (Cfrench58)
27 Oct-05:55:30 Re: fluorite panasqueira style - silvia's collection (Tobi)
27 Oct-04:53:40 Re: clinoclase, boleo, baja california, mexico ? (Alfredo)
27 Oct-04:45:34 Re: clinoclase, boleo, baja california, mexico ? (Tobi)
27 Oct-04:13:20 Old lead ingots with mine of our lady of montserrat (Lisa_anne)
26 Oct-23:40:11 The mizunaka collection - beryl (Am Mizunaka)
26 Oct-22:13:25 Re: don lum collection (Don Lum)
26 Oct-19:01:10 Clinoclase, boleo, baja california, mexico ? (Cfrench58)
26 Oct-18:23:14 Re: collection of ras (Robert Seitz)
26 Oct-18:16:36 Fluorite panasqueira style - silvia's collection (Silvia)
26 Oct-18:07:12 Re: silvia's collection - schorl/dravite panasqueira (Silvia)
26 Oct-15:59:54 Re: black, metallic, yellow oxide? (Deadhead)
26 Oct-15:48:38 Re: collection of sante celiberti (Sante Celiberti)
26 Oct-15:46:41 Re: munich show (mineralientage) 2021 (Fiebre Verde)
26 Oct-15:46:19 Re: munich show (mineralientage) 2021 (Alfredo)
26 Oct-15:30:39 Re: munich show (mineralientage) 2021 (Sante Celiberti)
26 Oct-15:03:00 Re: munich show (mineralientage) 2021 (Fiebre Verde)
26 Oct-11:03:37 Re: please help identify the composition of this granite (James Catmur)
26 Oct-10:08:36 Re: please help identify the composition of this granite (Peter Lemkin)
26 Oct-09:58:54 Re: please help identify the composition of this granite (Tsaintonge)

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  Topic: 15 years since the beginning of FMF. As time goes!
Pete Modreski

Replies: 19
Views: 2335

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: 915

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: 1505

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: 3226

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: 1073

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: 3821

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: 2234

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: 1792

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: 2959

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: 1919

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: 2969

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: 3588

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: 2581

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: 21836

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: 4356

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 ...
  Topic: Lake Superior agate with Copper?
Pete Modreski

Replies: 3
Views: 2135

PostForum: What is it? - Where is it from?   Posted: Jun 28, 2020 19:27   Subject: Re: Lake Superior agate with Copper?
No copper in that agate, KJ. That is just a "regular" Lake Superior agate, and the red color is from iron oxide (hematite) inclusions in the agate. Copper-bearing agate is extremely rare, ...
  Topic: I think it is manmade but....
Pete Modreski

Replies: 6
Views: 2855

PostForum: What is it? - Where is it from?   Posted: Jun 21, 2020 19:21   Subject: Re: I think it is manmade but....
Hi, Robson,
This is a different Pete answering you, but let me try.
There isn't any one simple answer to what you ask, only some general guidelines. Mostly, it's a matter of experience and familiari ...
  Topic: Happy Geologist Day
Pete Modreski

Replies: 2
Views: 6022

PostForum: Off-Topic and Introductions   Posted: Apr 05, 2020 14:09   Subject: Re: Happy Geologist Day
Happy Geologist Day to all of you, too! I've received several notes from friends about this today--one from Russia, and one from Germany, and I guess one from, a Russian friend living in Canada. The ...
  Topic: Identifying possible olivine specimen
Pete Modreski

Replies: 2
Views: 6254

PostForum: What is it? - Where is it from?   Posted: Mar 06, 2020 12:30   Subject: Re: Identifying possible olivine specimen
M,
Distinguishing between epidote and olivine is going to be a pretty difficult thing for you. I don't think the hardness or streak test is going to be at all possible to interpret--for a start, bot ...
  Topic: Unidentified green crystal
Pete Modreski

Replies: 21
Views: 12166

PostForum: What is it? - Where is it from?   Posted: Feb 21, 2020 15:14   Subject: Re: Unidentified green crystal
I wanted to add this too, as per what Alfredo said. In addition to needing a smooth (preferably polished) surface (I don't know how they'd perform on a rougher surface), there are only a dozen or so ...
 
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