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Newest topics and users posts
21 Jan-06:57:10 Re: collection anton chizhik (James Catmur)
21 Jan-04:33:15 Collection anton chizhik - please follow the rules (Jordi Fabre)
21 Jan-04:08:14 Re: quartz id (Steveb)
21 Jan-04:07:33 Re: silvia's collection (Tobi)
21 Jan-03:59:52 Re: quartz id (James Catmur)
21 Jan-03:22:53 Re: collection of firmo espinar (Tobi)
21 Jan-03:17:26 Re: collection anton chizhik (Tobi)
21 Jan-03:13:51 Re: quartz id (Tobi)
21 Jan-03:06:06 Re: quartz id (Bob Harman)
21 Jan-02:26:25 Re: quartz id (Lyaniq)
21 Jan-02:23:43 Re: quartz id (Lyaniq)
21 Jan-00:55:21 Re: quartz id (Bob Harman)
21 Jan-00:27:13 Quartz id (Lyaniq)
20 Jan-23:10:28 The mizunaka collection - quartz with calcite (Am Mizunaka)
20 Jan-22:00:47 Collection anton chizhik (Hereiam)
20 Jan-19:49:29 Re: forms involved in titanite crystal (Bob Carnein)
20 Jan-19:22:54 Re: forms involved in titanite crystal (Pete Richards)
20 Jan-17:41:50 Re: collection of firmo espinar (Firmo Espinar)
20 Jan-17:07:01 Re: silvia's collection (Bergur_e_sigurdarson)
20 Jan-17:01:45 Re: forms involved in titanite crystal (Bergur_e_sigurdarson)
20 Jan-16:49:26 Romanian tetrahedrite - silvia's collection (Silvia)
20 Jan-16:22:37 Re: forms involved in titanite crystal (Mark Holtkamp)
20 Jan-14:53:45 Re: forms involved in titanite crystal (Josele)
20 Jan-13:20:26 Re: forms involved in titanite crystal (Pete Richards)
20 Jan-13:10:05 Re: using iron and iron oxide as a green fuel (Aniol Soler)

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  Topic: Canon SLR with stacking
Peter Lemkin

Replies: 14
Views: 1637

PostForum: Off-Topic and Introductions   Posted: Nov 27, 2021 23:30   Subject: Re: Cannon SLR with stacking
If you put into a search engine something like 'digital camera with focus stacking' there are several [more than 20] different makers and cameras in a wide price and quality range - often in reviews c ...
  Topic: Gold for Collectors - The Book
Peter Lemkin

Replies: 7
Views: 30405

PostForum: Mineral Up Editions   Posted: Nov 18, 2021 00:33   Subject: Re: Gold for Collectors - The Book
After checking with the author, Joaquim Callén, the people who can have it for sale (if they have not finished it) are:

Gloria Staebler - Lithographie
Wayne and Dona Leicht
Ian Bruce
Lapis
Loui ...
  Topic: Pitcairn Island
Peter Lemkin

Replies: 2
Views: 685

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Nov 15, 2021 14:24   Subject: Re: Pitcairn Island
I am sorry to likely pour cold water on your dream that these possibly polished mineral beads are either from Pitcairn Island or contain gold. Pitcairn Island is formed by what is called a 'hot spot' ...
  Topic: All the Diamonds one could fill your house with - and more - so near...yet so far.....
Peter Lemkin

Replies: 10
Views: 8434

PostForum: Minerals and Mineralogy   Posted: Nov 13, 2021 00:15   Subject: New Mineral found from inside ultra-deep diamond
A new calcium silicate that can not usually exist on the surface, but which exists in quantity deep in the Earth where pressures allow its crystal structure to exist has been found and identified on t ...
  Topic: All the Diamonds one could fill your house with - and more - so near...yet so far.....
Peter Lemkin

Replies: 10
Views: 8434

PostForum: Minerals and Mineralogy   Posted: Nov 06, 2021 05:24   Subject: More on White Dwarf star exoplanet mineralogy!!! Further away than the Diamonds down below
I don't think any of us will get some of these exotic minerals in our collections or even see them in a museum. They are quite far away! One of my other passions other than minerals and mineralogy is ...
  Topic: Old lead ingots with mine of Our Lady of Montserrat
Peter Lemkin

Replies: 8
Views: 1761

PostForum: What is it? - Where is it from?   Posted: Oct 30, 2021 04:37   Subject: Re: Old lead ingots with mine of Our Lady of Montserrat
I would suggest you contact these people and tell them your story. The area, I see, has been mined for Pb since Roman times and it seems ended about the First World War - leaving the area one of the m ...
  Topic: Please help identify the composition of this granite
Peter Lemkin

Replies: 8
Views: 1894

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Oct 26, 2021 10:08   Subject: Re: Please help identify the composition of this granite
Sorry, you think your questions have simple or short answers. Most do not. I am not going to try to explain 'intrusives' or pegmatitic intrusives. There are papers, books and I'm sure websites on that ...
  Topic: Please help identify the composition of this granite
Peter Lemkin

Replies: 8
Views: 1894

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Oct 26, 2021 09:49   Subject: Re: Please help identify the composition of this granite
Thanks guys - some great info so far.

Matt - you pointed out that the Gold sections appear to be muscovite, and from looking at images, I agree!

Peter, I looked up some images and tried to fin ...
  Topic: Please help identify the composition of this granite
Peter Lemkin

Replies: 8
Views: 1894

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Oct 26, 2021 01:14   Subject: Re: Please help identify the composition of this granite
While it is granite, it is a slice through a special type of granite called a pegmatite. I suggest you look that up on the internet. There are different types of pegmatites and different minerals in d ...
  Topic: Munich Show (Mineralientage) 2021
Peter Lemkin

Replies: 27
Views: 7057

PostForum: News about shows   Posted: Oct 21, 2021 02:12   Subject: Re: Munich Show (Mineralientage) 2021
Jordi, How do the number of exhibitors [or total floor space with exhibitors] compare with pre-COVID times, generally?

Glad to see your official entry security badge has a smile face on it....perha ...
  Topic: Minerals and mysteries from a college collection
Peter Lemkin

Replies: 8
Views: 1706

PostForum: What is it? - Where is it from?   Posted: Oct 21, 2021 01:29   Subject: Re: Minerals and mysteries from a college collection
Yes, of course, check density and hardness - but I'm still almost sure it is a 'phosphorite' [hydroxyapatite] from Ukraine. When I lived in the USA or W. Europe I don't remember ever seeing them for s ...
  Topic: Minerals and mysteries from a college collection
Peter Lemkin

Replies: 8
Views: 1706

PostForum: What is it? - Where is it from?   Posted: Oct 20, 2021 01:24   Subject: Re: Minerals and mysteries from a college collection
I'm 99.9% sure I know the radiating ball mineral. I have many in my collection. It is Apatite (Var: Carbonate-rich Apatite) Ca5(PO4)3(Cl/F/OH) from the Khmelnytskyi Oblast, Ukraine. There is an image ...
  Topic: Alleged 'silvers' from Udokan?
Peter Lemkin

Replies: 10
Views: 1780

PostForum: Off-Topic and Introductions   Posted: Oct 14, 2021 01:45   Subject: Re: Alleged 'silvers' from Udokan?
While fake minerals can and do come from most everywhere, when I was in Russia I noted more than the usual number of people selling fakes of all manner of things. If one puts the words [or something s ...
  Topic: Just how fast can the crystals we love and collect grow?!
Peter Lemkin

Replies: 5
Views: 1807

PostForum: Minerals and Mineralogy   Posted: Oct 05, 2021 06:44   Subject: Re: Just how fast can the crystals we love and collect grow?!
For several years I lived in Aspen, Colorado - famous for its silver mines. Little known is that some of the old mines are being re-opened for specimens. One owner was kind enough to let me in. This m ...
  Topic: Just how fast can the crystals we love and collect grow?!
Peter Lemkin

Replies: 5
Views: 1807

PostForum: Minerals and Mineralogy   Posted: Sep 29, 2021 13:21   Subject: Re: Just how fast can the crystals we love and collect grow?!
Thanks James....I once knew that, but had forgotten. So all, if you want to read the article and the supplemental materials, diagrams, photos, etc. go to:

https://www.nature.com/articles/s41467-020 ...
  Topic: Just how fast can the crystals we love and collect grow?!
Peter Lemkin

Replies: 5
Views: 1807

PostForum: Minerals and Mineralogy   Posted: Sep 29, 2021 11:45   Subject: Just how fast can the crystals we love and collect grow?!
I can across this article which covered an area about mineralogy often neglected and very much of interest to me. I used to live in San Diego, and while I never got into the Stewart Mine [where this r ...
  Topic: Malachite stalactites, Katanga Province
Peter Lemkin

Replies: 2
Views: 1278

PostForum: Minerals and Mineralogy   Posted: Sep 18, 2021 05:18   Subject: Re: Malachite stalactites, Katanga Province
Have fun comparing! That looks like very unusual matrix under the malachite to me! A photo from the other side would be interesting.

https://www.mindat.org/gallery.php?frm_id=pager&cform_is_val ...
  Topic: Fulgurite
Peter Lemkin

Replies: 8
Views: 1806

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Sep 16, 2021 01:26   Subject: Re: Fulgurite
Yes, children [and adults] find fulgurites of interest! However, as this one lacks the hollow core and has been perhaps water-worn, I think it needs confirmation. I believe most types of the new miner ...
  Topic: Fulgurite
Peter Lemkin

Replies: 8
Views: 1806

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Sep 15, 2021 02:09   Subject: Re: Fulgurite
You say you got a positve ID on it. By whom? The stone knapper who sold it to you? Pardon my being skeptical until there is some validation by an expert of some kind opining on what it is or is not. W ...
  Topic: Fulgurite
Peter Lemkin

Replies: 8
Views: 1806

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Sep 14, 2021 23:47   Subject: Re: Fulgurite
Hello and welcome. What makes you so convinced it is a fulgurite? Have you compared it to the photos here https://www.mindat.org/gm/7747 ? Most, but not all, fulgurites have a central tube, and you ar ...
 
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