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Newest topics and users posts
02 Jul-14:58:25 The mizunaka collection - calcite with pyrite (Am Mizunaka)
02 Jul-14:44:48 Sainte-marie-aux-mines 2022 - the new discoveries (1) (Jordi Fabre)
01 Jul-16:16:08 Re: pyromorphite and ...? (Colin Robinson)
01 Jul-13:56:47 Re: twinned topaz? (John S. White)
01 Jul-12:20:34 Re: pyromorphite and ...? (Forrestblyth)
01 Jul-11:34:01 Re: caldbeck cumbria mineral (Forrestblyth)
01 Jul-11:25:31 Re: pyromorphite and ...? (Forrestblyth)
01 Jul-10:32:27 Re: twinned topaz? (Bob Carnein)
01 Jul-10:17:29 Re: collection of volkmar stingl (Volkmar Stingl)
01 Jul-10:15:24 Re: twinned topaz? (Yannick Cosson)
01 Jul-08:51:24 Re: twinned topaz? (Pete Richards)
01 Jul-07:43:29 Re: twinned topaz? (Josele)
01 Jul-06:38:46 Re: twinned topaz? (Bob Morgan)
01 Jul-05:07:43 Twinned topaz? (Yannick Cosson)
30 Jun-23:13:16 The mizunaka collection - fluorite (Am Mizunaka)
30 Jun-16:35:12 Re: pyromorphite and ...? (Colin Robinson)
30 Jun-16:29:27 Re: collection of firmo espinar (Firmo Espinar)
30 Jun-16:27:07 Re: linarite (Colin Robinson)
30 Jun-16:18:29 Re: barytocalcite (Colin Robinson)
30 Jun-14:20:08 Re: spherical inclusions in amethyst - cristobalite? vs fluorite (Roger Warin)
30 Jun-14:06:03 Re: spherical inclusions in amethyst - cristobalite? vs fluorite (Amir Akhavan)
30 Jun-08:05:23 Baryte (Forrestblyth)
30 Jun-07:58:42 Barytocalcite (Forrestblyth)
30 Jun-07:50:45 Re: caldbeck cumbria mineral (Kevin Schofield)
30 Jun-07:49:05 Baryte (Forrestblyth)

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  Topic: Twinned Topaz?
Pete Richards

Replies: 6
Views: 362

PostForum: What is it? - Where is it from?   Posted: Jul 01, 2022 08:51   Subject: Re: Twinned Topaz?
Your photo shows no faces. It appears that the free ends of both crystals are damaged. Are there good sharp crystal faces anywhere, and could you show them (as many as possible) in a photograph?

...
  Topic: Familiar label style
Pete Richards

Replies: 1
Views: 284

PostForum: What is it? - Where is it from?   Posted: Jun 18, 2022 09:57   Subject: Familiar label style
Here is a label of a TN specimen I obtained in 1993. It has a distinctive type font, and several of us northeast Ohio collectors have or have had specimens with labels like it. We've been trying to ...
  Topic: Crystallography question
Pete Richards

Replies: 6
Views: 512

PostForum: Minerals and Mineralogy   Posted: Jun 17, 2022 08:45   Subject: Re: Crystallography question
It is difficult to impossible to decipher crystallography from a photograph, except in the most general terms. The slight re-entrant shown does suggest twinning, but the faces involved appear to be c ...
  Topic: More Label Translation
Pete Richards

Replies: 9
Views: 1097

PostForum: What is it? - Where is it from?   Posted: Jun 14, 2022 14:52   Subject: Re: More Label Translation
The Unreadable Label

This Unreadable Label has provided quite an entertaining challenge to me and to others. I was interested because it is clearly about crystal faces, although it uses an old (Na ...
  Topic: New generation for picture - Ploum
Pete Richards

Replies: 1374
Views: 1311546

PostForum: Collection photos and Collector's page   Posted: May 31, 2022 11:57   Subject: Re: New generation for picture - Ploum
Dany can take the last one. I'll take the first one.

Beautiful specimens; masterful photography! Thank you, Ploum!
  Topic: More Label Translation
Pete Richards

Replies: 9
Views: 1097

PostForum: What is it? - Where is it from?   Posted: May 29, 2022 18:11   Subject: Re: More Label Translation
If the drawing attached to the label is of this specimen, it appears to be showing a different view. Does the little "wart" on the bottom of the drawing correspond to the slight bump visibl ...
  Topic: Need help identifying this rock
Pete Richards

Replies: 10
Views: 868

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: May 18, 2022 14:48   Subject: Re: Need help identifying this rock
I agree that it's not a natural stone, but I wonder if the colorless beads are present all the way through the piece, not just on the surface. The light weight suggests to me that it may be some sor ...
  Topic: Mineral Label Translation
Pete Richards

Replies: 8
Views: 987

PostForum: What is it? - Where is it from?   Posted: May 11, 2022 15:06   Subject: Re: Mineral Label Translation
Thanks, Tobi and Andreas Gerstenberg. I could not read that handwriting!

With the help of the translator DeepL, I suggest that a better translation for "Schafstiel" would be "sheep ...
  Topic: Tourmaline - Quartz epitaxy?
Pete Richards

Replies: 7
Views: 987

PostForum: Minerals and Mineralogy   Posted: Apr 23, 2022 19:53   Subject: Re: Tourmaline - Quartz epitaxy?
Thanks for the close-up pictures. I think they confirm that the quartz is not continuous throughout, which probably means that the quartz grew as several to many crystals oriented mostly the same dir ...
  Topic: Tourmaline - Quartz epitaxy?
Pete Richards

Replies: 7
Views: 987

PostForum: Minerals and Mineralogy   Posted: Apr 22, 2022 18:53   Subject: Re: Tourmaline - Quartz epitaxy?
Josele, your specimen of quartz on elbaite is certainly interesting. The parallel arrangement of many quartz crystals on the etched elbaite definitely suggests epitaxy.

Is it possible to get some ...
  Topic: Jade, chalcedony or????
Pete Richards

Replies: 7
Views: 1054

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Apr 08, 2022 18:31   Subject: Re: Jade, chalcedony or????
Ken, you have been rightly complimented for trying to do what you can to identify your specimens. But I'm afraid some confusion has crept in. Here are some questions and comments to try to clarify s ...
  Topic: Spherical inclusions in amethyst - cristobalite? vs fluorite
Pete Richards

Replies: 15
Views: 1588

PostForum: Minerals and Mineralogy   Posted: Mar 27, 2022 20:35   Subject: Re: Spherical inclusions in amethyst - cristobalite? vs fluorite
Amir, you probably know all of this better than I do....

I know of no publications.

But I wonder - do the spheroids penetrate into the amethyst or are they strictly on the surface of the amet ...
  Topic: Unusual habit for Pyrite.
Pete Richards

Replies: 28
Views: 3034

PostForum: Minerals and Mineralogy   Posted: Mar 23, 2022 20:08   Subject: Re: Unusual habit for Pyrite.
I have to voice my doubts about the identification of this specimen as chalcopyrite. Sante, you did an incomplete experiment! Smart to test your needle against a known chalcopyrite, but you did not ...
  Topic: Uncommon Herringbone Habit - Please help me identify this mineral
Pete Richards

Replies: 5
Views: 788

PostForum: What is it? - Where is it from?   Posted: Mar 21, 2022 12:55   Subject: Re: Uncommon Herringbone Habit - Please help me identify this mineral
I agree with Bob - it's gypsum..

If you have one to sacrifice, I'd try to split it down the middle parallel to the biggest flat surface - the surface we see in the first image. It should split a ...
  Topic: Unusual habit for Pyrite.
Pete Richards

Replies: 28
Views: 3034

PostForum: Minerals and Mineralogy   Posted: Mar 20, 2022 16:07   Subject: Re: Unusual habit for Pyrite.
I forgot to comment that carrolite cannot have a pyritohedron. Its crystal class is 4/m -3 2/m, and in that symmetry class the form in that position would be a tetrahexahedron, not a pyritohedron.
  Topic: Unusual habit for Pyrite.
Pete Richards

Replies: 28
Views: 3034

PostForum: Minerals and Mineralogy   Posted: Mar 20, 2022 15:56   Subject: Re: Unusual habit for Pyrite.
Hi, Sante!

You ask excellent questions. Some do not have answers that are at once short and complete! And my reply is neither short nor complete.

The semantic questions first:

I agree that ...
  Topic: Unusual habit for Pyrite.
Pete Richards

Replies: 28
Views: 3034

PostForum: Minerals and Mineralogy   Posted: Mar 18, 2022 18:56   Subject: Re: Unusual habit for Pyrite.
John is right to compare the crystal's appearance with a pyritohedron - which also has 12 faces. The similarity can be seen if you mentally rotate my right drawing 90°, in which case the striations i ...
  Topic: Unusual habit for Pyrite.
Pete Richards

Replies: 28
Views: 3034

PostForum: Minerals and Mineralogy   Posted: Mar 18, 2022 18:44   Subject: Re: Unusual habit for Pyrite.
This is a very interesting crystal. Pyrite certainly can have rhombic dodecahedron faces, but this is uncommon and such faces are usually subordinate to other, larger faces. With the usual disclaim ...
  Topic: Is this beryl?
Pete Richards

Replies: 14
Views: 1630

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Mar 18, 2022 07:39   Subject: Re: Is this beryl?
Another good candidate would be feldspar.
  Topic: Is this beryl?
Pete Richards

Replies: 14
Views: 1630

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Mar 18, 2022 07:34   Subject: Re: Is this beryl?
Perhaps I am geograhically myopic, but where is Bilula? Where is Rodope?
 
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