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Newest topics and users posts
18 Jan-18:36:38 The mizunaka collection - smoky quartz (Am Mizunaka)
18 Jan-17:35:15 Re: don lum collection (Don Lum)
18 Jan-11:27:14 Re: collection of ras (Robert Seitz)
18 Jan-09:50:00 Re: collection of michael shaw - ilvaite (Michael Shaw)
18 Jan-04:29:58 Re: collection of ras (Tobi)
17 Jan-22:53:41 Re: silvia's collection (Silvia)
17 Jan-22:42:23 The mizunaka collection - quartz (Am Mizunaka)
17 Jan-12:30:52 Re: collection of ras (Robert Seitz)
17 Jan-05:34:24 Re: collection of firmo espinar (Tobi)
17 Jan-04:08:41 Re: collection of sante celiberti (Tobi)
17 Jan-04:02:37 Re: silvia's collection (Tobi)
17 Jan-03:52:12 Re: tucson shows 2022 (Tobi)
16 Jan-08:33:31 Re: apophyllite from brazil - a new find from 2021? (Gagat Minerals)
15 Jan-22:46:01 Re: tucson shows 2022 - it's starting!! (Alfredo)
15 Jan-22:29:08 Re: tucson shows 2022 - it's starting!! (Bob Harman)
15 Jan-22:23:43 Re: apophyllite from brazil - a new find from 2021? (Alfredo)
15 Jan-22:19:22 The mizunaka collection - thin quartz (Am Mizunaka)
15 Jan-19:31:17 Apophyllite from brazil - a new find from 2021? (Gagat Minerals)
15 Jan-18:40:57 Re: alleged 'silvers' from udokan? (Bob Harman)
15 Jan-17:48:47 Tucson shows 2022 (Bob Kerr)
15 Jan-17:32:21 Re: alleged 'silvers' from udokan? (Alfredo)
15 Jan-16:52:31 Re: alleged 'silvers' from udokan? (Bob Harman)
15 Jan-16:23:26 Re: collection of michael shaw (Michael Shaw)
15 Jan-16:21:55 Chalcostibite - silvia's collection (Silvia)
15 Jan-14:22:05 Re: collection of sante celiberti (Sante Celiberti)

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  Topic: The Mizunaka Collection
James Catmur

Replies: 1871
Views: 1467524

PostForum: Collection photos and Collector's page   Posted: Jan 13, 2022 04:55   Subject: Re: The Mizunaka Collection - Quartz
Could be an epimorph I guess? - I have one from Castleton, Derbyshire which is a fluorite epimorph of a coral fossil

People do seem to mix the two terms (epi and pseudo) up

Label indicates that ...
  Topic: The Mizunaka Collection
James Catmur

Replies: 1871
Views: 1467524

PostForum: Collection photos and Collector's page   Posted: Jan 12, 2022 13:05   Subject: Re: The Mizunaka Collection - Fluorite
It really is almost invisible invisible crystal to the right
  Topic: Don Lum Collection
James Catmur

Replies: 1804
Views: 1511630

PostForum: Collection photos and Collector's page   Posted: Jan 10, 2022 09:57   Subject: Re: Don Lum Collection
Don

Do you have any more information on the Calcite's locality?
  Topic: Don Lum Collection
James Catmur

Replies: 1804
Views: 1511630

PostForum: Collection photos and Collector's page   Posted: Jan 10, 2022 09:22   Subject: Re: Don Lum Collection
Don

Do you have any more information on the Calcite's locality?
  Topic: A new book on British mineralogy - Making it Mine – Sir Arthur Russell
James Catmur

Replies: 0
Views: 195

PostForum: Mineralogical Literature   Posted: Jan 09, 2022 10:26   Subject: A new book on British mineralogy - Making it Mine – Sir Arthur Russell
Roy Starkey has almost finished his latest book! If you would like more information about the book follow this link:

https://www.mindat.org/article.php/4246/Coming+soon+%E2%80%93+a+new+book+on+Bri ...
  Topic: Seeking methodology for identifying crystalline forms.
James Catmur

Replies: 11
Views: 701

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Jan 03, 2022 15:36   Subject: Re: Seeking methodology for identifying crystalline forms.
Angel

He was quoting a message he got via email or PM, so it was not a post on this forum. As Admins we do get direct messages that are useful, so we add them as quotes.
  Topic: Don Lum Collection
James Catmur

Replies: 1804
Views: 1511630

PostForum: Collection photos and Collector's page   Posted: Jan 03, 2022 15:33   Subject: Re: Don Lum Collection
Carles

I had the same thought - otherwise we can only give the state

James

I will change the location information on my label and would appreciate very much if one of the administrators will ...
  Topic: Seeking methodology for identifying crystalline forms.
James Catmur

Replies: 11
Views: 701

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Jan 03, 2022 15:27   Subject: Re: Seeking methodology for identifying crystalline forms.
Angles are key! Look at the face and look at the angles at the corners. 90 degrees at all the corners and you have a cubic form, etc.

I worked with an artist some year ago who tried to paint pictu ...
  Topic: Measuring the specific gravity?
James Catmur

Replies: 13
Views: 626

PostForum: Off-Topic and Introductions   Posted: Dec 30, 2021 11:25   Subject: Re: Measuring the specific gravity?
Angel

That is great - we often get people who have not read our 'rules' and it takes time to convince them that we really cannot help as it is not our area of expertise (or interest)

James
  Topic: Measuring the specific gravity?
James Catmur

Replies: 13
Views: 626

PostForum: Off-Topic and Introductions   Posted: Dec 30, 2021 05:22   Subject: Re: Measuring the specific gravity?
Angel, welcome

This page may help you with specific gravity.

https://www.mindat.org/advanced_search.php

As you will see we do not deal with tumbled rocks and do ask that you do tests (speci ...
  Topic: Peruvian / French or Cornish Chalcopyrite on Fluorite?
James Catmur

Replies: 12
Views: 1016

PostForum: What is it? - Where is it from?   Posted: Dec 29, 2021 15:27   Subject: Re: Peruvian / French or Cornish Chalcopyrite on Fluorite?
You have been asking different people on many different platforms - which one do you want us to use?

I do have an opinion but it it totally hors-piste
  Topic: Merry Christmas and Happy New Year 2022!
James Catmur

Replies: 18
Views: 1254

PostForum: Comments & Suggestions   Posted: Dec 23, 2021 12:43   Subject: Re: Merry Christmas and Happy New Year 2022!
Not an Xmas card but a New Year thought

For a talk I hope to do in February I thought it would be useful to look back to when we as a hobby began to move on-line. I had a look at how many times an ...
  Topic: Hawaiian Minerals
James Catmur

Replies: 7
Views: 927

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Dec 09, 2021 12:15   Subject: Re: Hawaiian Minerals
Chalcedony
  Topic: Canon SLR with stacking
James Catmur

Replies: 14
Views: 1603

PostForum: Off-Topic and Introductions   Posted: Dec 06, 2021 13:14   Subject: Re: Canon SLR with stacking
As I already use a Canon body and have lots of Canon lenses I am tempted by the idea of their body and stacking. But I would be looking at US$lots for the new body. Let me check my lenses against th ...
  Topic: May I get a read
James Catmur

Replies: 4
Views: 832

PostForum: What is it? - Where is it from?   Posted: Dec 01, 2021 15:07   Subject: Re: May I get a read
I agree too
  Topic: Canon SLR with stacking
James Catmur

Replies: 14
Views: 1603

PostForum: Off-Topic and Introductions   Posted: Nov 29, 2021 07:59   Subject: Re: Cannon SLR with stacking
This article explains how it works.

https://www.the-digital-picture.com/Canon-Cameras/Canon-Focus-Bracketing.aspx

So it only makes sense, as Steve says. if you already own a suitable lens.

Wh ...
  Topic: Canon SLR with stacking
James Catmur

Replies: 14
Views: 1603

PostForum: Off-Topic and Introductions   Posted: Nov 29, 2021 07:56   Subject: Re: Cannon SLR with stacking
Steve, my understanding is that the camera automatically take multiple shots and then you post-process them with software to stack them. It seems that you tell it how many shots to take and the step ...
  Topic: Canon SLR with stacking
James Catmur

Replies: 14
Views: 1603

PostForum: Off-Topic and Introductions   Posted: Nov 29, 2021 07:51   Subject: Re: Cannon SLR with stacking
Comment from Steve B:


No experience with the FS cameras but do some closer research before buying. Is it just a feature you’d like to have or something you’d buy the camera specifically for? For ...
  Topic: Canon SLR with stacking
James Catmur

Replies: 14
Views: 1603

PostForum: Off-Topic and Introductions   Posted: Nov 28, 2021 06:36   Subject: Re: Cannon SLR with stacking
I read "Some Canon cameras such as the Canon EOS R5, Canon EOS R6, Canon EOS RP and Canon EOS 90D feature built-in automatic focus bracketing, to make capturing your focus stacking images even ea ...
  Topic: Canon SLR with stacking
James Catmur

Replies: 14
Views: 1603

PostForum: Off-Topic and Introductions   Posted: Nov 27, 2021 13:35   Subject: Canon SLR with stacking
Has anyone tried the Canon DSLR bodies that have built-in focus stacking? Sounds like a cool idea, but they are not cheap!
 
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