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Newest topics and users posts
27 May-19:33:46 Re: on the mineralogy of shijiangshan, ulanhad league, inner mongolia a.r. (china) (Cesar M. Salvan)
27 May-14:47:00 Re: a mineralogical trip through the states of usa - indiana (Bob Harman)
27 May-13:49:11 Re: a mineralogical trip through germany / sachsen - saxony (Jesse Fisher)
27 May-13:21:14 Re: need advice on next step. (Jesse Fisher)
27 May-13:19:28 Re: need advice on next step. (Lluis)
27 May-13:17:10 Re: need advice on next step. (Bill E)
27 May-13:12:46 Re: need advice on next step. (Peter Lemkin)
27 May-13:07:28 Sainte marie-aux-mines show 2018 (Jordi Fabre)
27 May-13:05:33 Re: collection of michael shaw (Crosstimber)
27 May-12:58:45 Re: need advice on next step. (Bill E)
27 May-12:56:03 Re: need advice on next step. (Bill E)
27 May-12:48:04 Re: need advice on next step. (Crosstimber)
27 May-12:33:55 Re: need advice on next step. (Bill E)
27 May-12:18:14 Re: need advice on next step. (Peter Lemkin)
27 May-12:04:40 Re: need advice on next step. (Bob Harman)
27 May-11:59:02 Re: need advice on next step. (Lluis)
27 May-11:57:30 Re: need advice on next step. (Bob Harman)
27 May-11:30:46 Re: need advice on next step. (Peter Lemkin)
27 May-10:30:24 Need advice on next step. (Bill E)
27 May-01:21:44 The mizunaka collection - fluorite (Am Mizunaka)
26 May-16:25:12 Re: peruvian quartz twin (Pete Richards)
26 May-14:01:57 Re: can anyone help me identify this strange rock formation (Olsufkajeff)
26 May-13:22:04 Re: peruvian quartz twin (Jordi Fabre)
26 May-13:10:38 Re: can anyone help me identify this strange rock formation (Rockhound.Newmexico)
26 May-13:07:59 Re: can anyone help me identify this strange rock formation (Rockhound.Newmexico)

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Author Message
  Topic: Agates in Sicily?
Pete Modreski

Replies: 9
Views: 937

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: 482

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: 784

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: 600

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 ...
  Topic: Identity or locality of this dense, spherulitic mineral?
Pete Modreski

Replies: 5
Views: 600

PostForum: What is it? - Where is it from?   Posted: Apr 19, 2018 14:35   Subject: Identity or locality of this dense, spherulitic mineral?
Dear Forum members, my turn again to try to ask for help with an identification question. This specimen was among a batch donated to a local group to be put in a silent auction or similar use. They s ...
  Topic: What kind of rock am I ? volcanic with blue pockets
Pete Modreski

Replies: 6
Views: 764

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Apr 17, 2018 11:03   Subject: Re: What kind of rock am I ? volcanic with blue pockets
There are combinations possible; these could be agate/chalcedony filling the vesicles, and then coated on their exterior with a thin layer of the blue-green celadonite. Always lots of possibilities, ...
  Topic: Zircon or Spinel?
Pete Modreski

Replies: 16
Views: 1260

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Apr 09, 2018 18:54   Subject: Re: Zircon or Spinel?
Nick, here is a suggestion, if you have access to ultraviolet lights.

Under longwave UV, pink or red spinel USUALLY shows a noticeable red fluorescence (like ruby). In contrast, most light-colored ...
  Topic: Is this fluorite?
Pete Modreski

Replies: 28
Views: 2295

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Apr 03, 2018 12:20   Subject: Re: Is this fluorite?
Bill, if you Google-image search "slag glass", you will see lots of pictures of similar-looking glass to your piece, many of which are blue or green. It's also called "cullet glass&quo ...
  Topic: San Benito County
Pete Modreski

Replies: 9
Views: 1610

PostForum: Minerals and Mineralogy   Posted: Mar 15, 2018 13:26   Subject: Re: San Benito County
Really nice specimen and photos, Roger, thanks!
  Topic: Percentage of pigment
Pete Modreski

Replies: 6
Views: 1038

PostForum: Minerals and Mineralogy   Posted: Mar 14, 2018 11:16   Subject: Re: Percentage of pigment
Tom, Peter Lemkin's reply to you was a good one.
But it's easier to give an answer for some minerals than for others. Those gem minerals that are colored by the simple presence of a metal ion that is ...
  Topic: Hello, please help me identify these...
Pete Modreski

Replies: 1
Views: 748

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Mar 05, 2018 13:26   Subject: Re: Hello, please help me identify these...
Dear Antag76,

I think your best guidance for now and the future is just to keep reading and looking up information about rocks, and look at displays in museums (or at rock and mineral shows) whenev ...
  Topic: A new find: Hoganite from Morocco
Pete Modreski

Replies: 17
Views: 3017

PostForum: Minerals and Mineralogy   Posted: Feb 21, 2018 12:43   Subject: Re: A new find: Hoganite from Morocco
I had to look up hoganite to see what it was. So, it's copper acetate monohydrate. Given the unusual nature of the mineral and the abundance of it shown in these specimens (vs. the scarcity of it at ...
  Topic: Concrete as a mineral
Pete Modreski

Replies: 6
Views: 1317

PostForum: Off-Topic and Introductions   Posted: Jan 29, 2018 17:57   Subject: Re: Concrete as a mineral
Yes, Tom, as has been said, it's a very complicated subject.
One can, indeed, discuss concrete as "a rock", but the part of your question, "what mineral would it be", isn't exactl ...
  Topic: Help Identifying Unusual Fireplace Rocks
Pete Modreski

Replies: 11
Views: 1796

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Jan 24, 2018 16:05   Subject: Re: Help Identifying Unusual Fireplace Rocks
Well, Opositica, I think no one has responded because it's pretty hard to impossible to really tell what that one is--to make any guess that's likely to be correct. It "could" be a type of ...
  Topic: A Bit On The Economics Of Being A mineral Dealer
Pete Modreski

Replies: 11
Views: 2304

PostForum: Off-Topic and Introductions   Posted: Jan 19, 2018 12:13   Subject: Re: A Bit On The Economics Of Being A mineral Dealer
Bob, for what it's worth, from what you described about the Midwestern dealers that you surveyed, I would tend to think that these would more likely be classed as "low-end" rather than " ...
  Topic: Locality for this probable natrolite (?) specimen?
Pete Modreski

Replies: 5
Views: 1303

PostForum: What is it? - Where is it from?   Posted: Jan 19, 2018 00:06   Subject: Re: Locality for this probable natrolite (?) specimen?
Thanks for the reply and for posting your picture! (And thanks for your replies too, John & Pete). Wow, your specimen looks exactly like the one we have (though a bit cleaner). So it seems likel ...
  Topic: Locality for this probable natrolite (?) specimen?
Pete Modreski

Replies: 5
Views: 1303

PostForum: What is it? - Where is it from?   Posted: Jan 18, 2018 19:09   Subject: Locality for this probable natrolite (?) specimen?
Forum folks, for a change I have a specimen to ask if anyone recognizes the identity or locality of (it was among material donated for the gift shop at Dinosaur Ridge--no labeling came with it); shown ...
  Topic: Help Identifying Unusual Fireplace Rocks
Pete Modreski

Replies: 11
Views: 1796

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Jan 17, 2018 16:52   Subject: Re: Help Identifying Unusual Fireplace Rocks
They are rocks with a lot of mica in them--that's what you are seeing.

In general, a mica-rich rock like these is schist, a type of metamorphic rock.

The pink rock, however, probably contains le ...
  Topic: Help Identifying Unusual Fireplace Rocks
Pete Modreski

Replies: 11
Views: 1796

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Jan 17, 2018 10:47   Subject: Re: Help Identifying Unusual Fireplace Rocks
Good one!
  Topic: Help Identifying Unusual Fireplace Rocks
Pete Modreski

Replies: 11
Views: 1796

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Jan 17, 2018 10:09   Subject: Re: Help Identifying Unusual Fireplace Rocks
And it looks to be amethyst (purple quartz). It is purple, as it appears in the photo, yes?
 
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