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Newest topics and users posts
27 Nov-04:04:58 Re: minerals to be found in only one location (David)
27 Nov-03:55:29 Re: minerals to be found in only one location (David)
27 Nov-03:34:09 The mizunaka collection - quartz (Am Mizunaka)
27 Nov-01:38:48 Re: minerals to be found in only one location (Peter Lemkin)
26 Nov-20:22:40 Re: minerals to be found in only one location (Alfredo)
26 Nov-20:09:39 Re: minerals to be found in only one location (David)
26 Nov-19:59:36 Re: minerals to be found in only one location (David)
26 Nov-17:11:43 Re: how hard is it to find a new mineral species? (Jordi Fabre)
26 Nov-16:22:43 Re: minerals to be found in only one location (Romain M)
26 Nov-16:04:31 Minerals to be found in only one location (David)
26 Nov-15:28:25 Re: how hard is it to find a new mineral species? (David)
26 Nov-15:16:40 Re: how hard is it to find a new mineral species? (David)
26 Nov-10:15:40 Re: collection of volkmar stingl (Volkmar Stingl)
26 Nov-04:37:05 The mizunaka collection - rhodochrosite (Am Mizunaka)
25 Nov-09:44:09 Re: collection of michael shaw (Michael Shaw)
24 Nov-18:39:08 The mizunaka collection - eosphorite (Am Mizunaka)
24 Nov-16:59:55 Re: the mizunaka collection - rhodochrosite (Am Mizunaka)
24 Nov-16:16:01 Re: collection of firmo espinar (Firmo Espinar)
24 Nov-03:39:41 Re: the mizunaka collection (Tobi)
23 Nov-15:32:20 Re: a new mineral species: pendevilleite (Roger Warin)
23 Nov-13:02:41 Re: collection of michael shaw (James Catmur)
23 Nov-10:39:48 Re: collection of michael shaw (Michael Shaw)
23 Nov-04:51:32 The mizunaka collection - rhodochrosite (Am Mizunaka)
23 Nov-03:58:35 Re: the mizunaka collection - smoky quartz (Tobi)
23 Nov-03:55:59 Re: collection of casimir sarisky (Tobi)

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  Topic: Dark, metallic mystery mineral - Magnetite? Ilmenite? Hematite?
Pete Richards

Replies: 8
Views: 978

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Oct 04, 2022 09:58   Subject: Re: Dark, metallic mystery mineral - Magnetite? Ilmenite? Hematite?
... it appears like there's an entire layer of this material under the settlements on the island,that is slowly getting weathered out. That would speak against a synthetic material.

Can you actual ...
  Topic: Could it be a fulgurite?
Pete Richards

Replies: 3
Views: 634

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Sep 29, 2022 10:21   Subject: Re: Could it be a fulgurite?
If it's a fulgarite, you might expect some melted and fused grains of sand around a hollow center.
  Topic: Cool rock
Pete Richards

Replies: 4
Views: 1020

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Aug 22, 2022 08:30   Subject: Re: Cool rock
In the context of a porphyry (or perhaps better a vesicular basalt or other rock), the elongation of the white structures bothers me.

An alternative explanation of this object is that it is a fossi ...
  Topic: Dragon Stone / Septarian Concretion
Pete Richards

Replies: 7
Views: 1431

PostForum: Off-Topic and Introductions   Posted: Aug 13, 2022 07:19   Subject: Re: Dragon Stone / Septarian Concretion
I was wondering if anyone has ever seen a Septarian Concretion that is this large before?

Now that I look at this picture again, I think that this is not a septarian concretion after all. I think ...
  Topic: Dragon Stone / Septarian Concretion
Pete Richards

Replies: 7
Views: 1431

PostForum: Off-Topic and Introductions   Posted: Aug 13, 2022 06:56   Subject: Re: Dragon Stone / Septarian Concretion
In certain middle Paleozoic shales in Ohio, septarian concretions are abundant and reach 2 meters in diameter. They are mineralized with dolomite of several generations, quartz, lesser barite, occasi ...
  Topic: Unknown crystal
Pete Richards

Replies: 16
Views: 1833

PostForum: What is it? - Where is it from?   Posted: Aug 10, 2022 09:18   Subject: Re: Unknown crystal
The "dendrites" extending into the barite are more of the same material that forms the dots on the surface. They indicate that the barite and the black material were forming at the same tim ...
  Topic: Twinned Topaz?
Pete Richards

Replies: 8
Views: 2353

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: 728

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: 1455

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: 2055

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: 1400
Views: 1451535

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: 2055

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: 1828

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: 1864

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: 1759

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: 1759

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: 1766

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: 3232

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: 4823

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: 1284

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 ...
 
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