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The place to share your mineralogical experiences

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Newest topics and users posts
18 Sep-10:45:53 Re: unidentified vitreous stone (Josele)
18 Sep-10:34:21 Re: unidentified vitreous stone (Vinoterapia)
18 Sep-10:15:15 Re: unidentified vitreous stone (Joie Geurts)
18 Sep-09:34:26 Re: the mizunaka collection (Crosstimber)
18 Sep-08:51:35 Re: unidentified vitreous stone (Vinoterapia)
18 Sep-07:08:46 Re: unidentified vitreous stone (Josele)
18 Sep-06:43:41 Re: unidentified vitreous stone (Joie Geurts)
18 Sep-06:10:27 Re: unidentified vitreous stone (Volkmar Stingl)
18 Sep-05:14:36 Re: the mizunaka collection (Pierre Joubert)
18 Sep-05:11:55 Re: unidentified vitreous stone (Joie Geurts)
18 Sep-02:24:48 The mizunaka collection - fluorite (Am Mizunaka)
18 Sep-02:21:38 Re: royal cornwall museum mineral gallery - your support is needed (Robert Seitz)
17 Sep-20:03:34 Re: unidentified vitreous stone (Josele)
17 Sep-12:37:24 Unidentified vitreous stone (Joie Geurts)
17 Sep-05:00:27 Re: collection of heimo hellwig (Heimo Hellwig)
17 Sep-03:04:58 Re: possible slag (Jessieg)
17 Sep-02:45:03 Re: royal cornwall museum mineral gallery - your support is needed (Robert Seitz)
16 Sep-17:28:39 Re: possible slag. (Josele)
16 Sep-14:16:28 Possible slag (Jessieg)
16 Sep-12:10:10 Re: collection of michael shaw (Crosstimber)
16 Sep-10:38:28 Re: don lum collection (Jordi Fabre)
16 Sep-07:39:31 Re: roadside geology of vermont (Jordi Fabre)
15 Sep-16:24:26 Re: beautiful flat crystals - what is this?? (Lluis)
15 Sep-15:54:37 Re: roadside geology of vermont (Nellsrocks)
15 Sep-15:23:34 Re: collection of fiebre verde - muzo (#703) (Fiebre Verde)

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The time now is Sep 18, 2018 11:06

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  Topic: 2018 Jim and Gail Spann go to Denver Gem and Mineral shows
Pete Modreski

Replies: 24
Views: 2245

PostForum: Mineral Shows by Gail Spann   Posted: Sep 08, 2018 13:57   Subject: Re: 2018 Jim and Gail Spann go to Denver Gem and Mineral shows
Gail, we love seeing your superb displays, and we all REALLY appreciate the trouble you and Jim go to, preparing and bringing them! THANK YOU! I'll look forward to seeing you at the show.
  Topic: Norwegian jasper "puddingstones"
Pete Modreski

Replies: 3
Views: 235

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Sep 04, 2018 17:57   Subject: Re: Norwegian jasper "puddingstones"
That can be a very complicated question, and maybe not with a clear answers. The shades of red and purple--inclusions of iron oxide (hematite). The bluish... who knows! (That's my answer.)
  Topic: Norwegian jasper "puddingstones"
Pete Modreski

Replies: 3
Views: 235

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Sep 04, 2018 15:07   Subject: Re: Norwegian jasper "puddingstones"
Very nice, Kara, I always appreciate neat looking "puddingstones". [The "jasper conglomerate" from Ontario is a favorite.] As to the bluish pebble--it's really kind of hard to be ...
  Topic: Funny breccia
Pete Modreski

Replies: 8
Views: 448

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Aug 14, 2018 13:47   Subject: Re: funny breccia
Along a similar vein, there is a very nice book, "The Planet in a Pebble", by Jan Zalasiewicz (Oxford Univ. Press), that takes one beach pebble (it's from Wales--kind of a slate, with a whit ...
  Topic: Funny breccia
Pete Modreski

Replies: 8
Views: 448

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Aug 14, 2018 12:38   Subject: Re: funny breccia
Yes, that is a very neat looking and interesting breccia, and, what more can one say? Lots of quartz veining, some red granitic rock and some (some kind of rock) with lots of epidote in it... nice!
  Topic: pink and green mineral ID question
Pete Modreski

Replies: 5
Views: 395

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Aug 12, 2018 16:57   Subject: Re: pink and green mineral ID question
One of my guesses for the possible identity of the pale green mineral is scapolite (given that it appears to be clearly too hard to be mica, and so presumably not apatite either). Some other possibil ...
  Topic: pink and green mineral ID question
Pete Modreski

Replies: 5
Views: 395

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Aug 12, 2018 14:06   Subject: Re: pink and green mineral ID question
I'll offer a first try at answering you, Kara, and we'll see if anyone else has some suggestions.

I think the pink mineral in both (1) and (2) is pretty surely rose quartz. And yes, in (1), the ve ...
  Topic: Crystal cluster with bluish rocks in it held together with calcite?
Pete Modreski

Replies: 6
Views: 440

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Aug 10, 2018 11:37   Subject: Re: Crystal cluster with bluish rocks in it held together with calcite?
Dear cheald,

Your photos really do not give enough information to give us any chance of identifying the mineral(s) in your specimen--other than the white calcite, which seems pretty obvious, becaus ...
  Topic: Halite
Pete Modreski

Replies: 4
Views: 305

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Aug 08, 2018 17:04   Subject: Re: Halite
Ah, thanks, sorry, I missed that line in the photo description. Well, then, given the color--I guess it could pretty well be from "anywhere".
  Topic: Halite
Pete Modreski

Replies: 4
Views: 305

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Aug 08, 2018 14:01   Subject: Re: Halite
Hi, Oliver,

Possibly, no one has responded to you yet, because no one who's looked at your pictures has a definite opinion as to where this halite might be from, and whether it is natural or artifi ...
  Topic: We celebrate the 12th anniversary of the beginning of FMF!
Pete Modreski

Replies: 19
Views: 862

PostForum: Comments & Suggestions   Posted: Aug 07, 2018 13:03   Subject: Re: Today we celebrate the 12th anniversary of the beginning of FMF!
More congratulations, Jordi, for creating and maintaining this Forum, and to all the staff & monderators and everyone!

But, gosh, I'm writing this, but we may be in trouble if every one of the ...
  Topic: Staurolite in mica schist and a question about rock identification
Pete Modreski

Replies: 16
Views: 1034

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Jul 30, 2018 12:11   Subject: Re: Staurolite in mica schist and a question about rock identification
Kara, it is always a problem for us, that this Forum is as you know, for people who enjoy/collect/study/explore mineral specimens (and interesting rocks) to share pictures, questions, information.
...
  Topic: Staurolite in mica schist and a question about rock identification
Pete Modreski

Replies: 16
Views: 1034

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Jul 29, 2018 22:33   Subject: Re: Staurolite in mica schist and a question about rock identification
Kara, there's nothing wrong with posting about rocks as well as minerals here--as long as they are of some interest, and you are either sharing something about interesting examples, or trying to figur ...
  Topic: ID this rock with a wierd (melt?)structure
Pete Modreski

Replies: 4
Views: 497

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Jul 23, 2018 07:51   Subject: Re: ID this rock with a wierd (melt?) structure
Kara, I'm pretty certain that this is an igneous rock you have. It's a fairly fine-grained porphyry; magma that cooled, not real fast as in lava on the surface, but not very slowly deep underground t ...
  Topic: Glass or something else?
Pete Modreski

Replies: 13
Views: 1156

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Jul 02, 2018 11:41   Subject: Re: Glass or something else?
Yes, glass. The "snowflakes" can form when the molten glass is cooled slowly enough to allow that to happen; either accidentally, or on purpose to make an attractive pattern within the glas ...
  Topic: I need help identifying these rocks, please. Thank you
Pete Modreski

Replies: 2
Views: 1003

PostForum: What is it? - Where is it from?   Posted: Jun 07, 2018 12:33   Subject: Re: I need help identifying these rocks, please. Thank you
Dear donjones,

I will just second the comment, that you need to read and try to respond to the "Asking What is This..." advice on the Forum guidance pages.

For rock samples such as wha ...
  Topic: Agates in Sicily?
Pete Modreski

Replies: 9
Views: 1971

PostForum: Rockhounding trips   Posted: Apr 27, 2018 13:28   Subject: Re: Agates in Sicily
What an interesting series of stories! Just shows us, how much one can necessarily trust "supposedly reliable sources"... like Pliny and Theophrastus, no less!


Bad News Alan, no agates ...
  Topic: Biotite?? Not sure what this
Pete Modreski

Replies: 5
Views: 838

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Apr 23, 2018 18:10   Subject: Re: Biotite?? Not sure what this
Yes, I think all will agree that this is biotite.
  Topic: Help identifying this conglomerate
Pete Modreski

Replies: 8
Views: 1761

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Apr 23, 2018 11:45   Subject: Re: Help identifying this conglomerate
Wow, quite a rock--never seen anything quite like this.

The very smooth shiny surface does look suspicious--perhaps either polished, or sprayed with acrylic.

But, my other thought; rather than c ...
  Topic: Identity or locality of this dense, spherulitic mineral?
Pete Modreski

Replies: 5
Views: 1164

PostForum: What is it? - Where is it from?   Posted: Apr 20, 2018 17:51   Subject: Re: Identity or locality of this dense, spherulitic mineral?
Thanks for asking this, Jordi, I should have reported this to begin with.

I just did a test with dilute HCl more carefully than I did before. A first, quick test had seemed to show, no fizzing. Bu ...
 
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