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13 Feb-11:16:33 Re: collection of michael shaw -tucson 2025 (Michael Shaw)
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13 Feb-09:33:26 Re: it's tucson time again - 2025 (Bob Kerr)
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11 Feb-04:03:47 Re: crystal habit identification (James Catmur)
10 Feb-17:25:08 Re: crystal habit identification (Jaime_cerdeira)
10 Feb-16:55:09 Re: collection of michael shaw (Michael Shaw)
10 Feb-15:39:10 Re: crystal habit identification (Roger Warin)
10 Feb-08:38:39 Re: the mim museum in beirut, lebanon (Mim Museum)
10 Feb-06:25:34 Re: crystal habit identification (Jaime_cerdeira)
10 Feb-06:12:49 Re: crystal habit identification (Jaime_cerdeira)

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  Topic: Crystal habit identification
Roger Warin

Replies: 6
Views: 553

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Feb 10, 2025 15:39   Subject: Re: Crystal habit identification
Since no one answers, because the photos are not expressive, I suggest that it is the same previous habit in which the prism has disappeared.
This calcite would therefore only be made of the rhombohe ...
  Topic: Crystal habit identification
Roger Warin

Replies: 6
Views: 553

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Feb 10, 2025 04:03   Subject: Re: Crystal habit identification
Hello,
These crystals are short prisms m{10-10 } with a classical termination e{01-12}}. Often it's the other way around, with the prism dominating and the rhombohedral termination only appearing lat ...
  Topic: Unknown from Tsumeb
Roger Warin

Replies: 11
Views: 1115

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Feb 01, 2025 09:15   Subject: Re: Unknown from Tsumeb
About Minrecordite and about light
Hello
I bought this beautiful Minrecordite sample in 1984.
It is type A. I don't know what that means.
The tiny rhombohedrons of minrecordite surround splendid d ...
  Topic: Limonitized garnet?
Roger Warin

Replies: 36
Views: 6089

PostForum: What is it? - Where is it from?   Posted: Jan 30, 2025 15:10   Subject: Re: Limonitized garnet?
The name forsterite is restricted to those species with no more than 10 percent magnesium substituting for iron. Compositions intermediate to these series end-members are identified which is an expres ...
  Topic: Limonitized garnet?
Roger Warin

Replies: 36
Views: 6089

PostForum: What is it? - Where is it from?   Posted: Jan 30, 2025 15:05   Subject: Re: Limonitized garnet?
Still on the subject of olivines and their solid solutions.
I say this because I know the world of amateurs, having run a club for over 50 years. We're an interphase between scientists and beginners. ...
  Topic: Limonitized garnet?
Roger Warin

Replies: 36
Views: 6089

PostForum: What is it? - Where is it from?   Posted: Jan 28, 2025 04:53   Subject: Re: Limonitized garnet?
Hello Herwig,
Thank you for giving me your opinion, which is very respectable since it's the official standard.
By profession, I've always been on the frontiers of knowledge. But of course my opinio ...
  Topic: Limonitized garnet?
Roger Warin

Replies: 36
Views: 6089

PostForum: What is it? - Where is it from?   Posted: Jan 27, 2025 17:12   Subject: Re: Limonitized garnet?
Please help me.
After 70 years of collecting, I no longer know how to write a label for this automorphic mineral, whose face indices I have noted.
I think I've reached a good level of mineralogical ...
  Topic: Limonitized garnet?
Roger Warin

Replies: 36
Views: 6089

PostForum: What is it? - Where is it from?   Posted: Jan 26, 2025 23:17   Subject: Re: Limonitized garnet?
Thank you, Alfredo,
My comment concerns the IMA, whose scientific rigor, obviously necessary, sometimes bewilders the amateur. Scientists obviously have a background.
It seems to me that there is a ...
  Topic: Limonitized garnet?
Roger Warin

Replies: 36
Views: 6089

PostForum: What is it? - Where is it from?   Posted: Jan 26, 2025 15:43   Subject: Re: Limonitized garnet?
Isn't IMA, limonite, a rock and not a mineral species?
  Topic: Limonitized garnet?
Roger Warin

Replies: 36
Views: 6089

PostForum: What is it? - Where is it from?   Posted: Jan 24, 2025 16:26   Subject: Re: Limonitized garnet?
Hello,
I believe in a pseudomorphosis of a garnet.
The texture of this specimen is not that of a crystal.
I think we often forget that water is an extracting agent of SiO2.
Obviously the water mus ...
  Topic: Libyan Desert Glass Structure
Roger Warin

Replies: 23
Views: 2725

PostForum: Minerals and Mineralogy   Posted: Jan 14, 2025 15:03   Subject: Re: Libyan Desert Glass Structure
Some bubbles and Sclieren in LDG. © R. Warin.

BLACK VEILS :

This phase presents traces of siderophile elements including iridium, osmium, platinoids, which form black veils during drying.
In ...
  Topic: Libyan Desert Glass Structure
Roger Warin

Replies: 23
Views: 2725

PostForum: Minerals and Mineralogy   Posted: Jan 14, 2025 15:01   Subject: Re: Libyan Desert Glass Structure
OTHER CURIOSITIES: - SCHLIEREN – BUBBLES - SPACE MATERIAL

As for Schlieren, they result from an optical phenomenon highlighting the local contractions and decompressions of the gel in its flow whic ...
  Topic: Libyan Desert Glass Structure
Roger Warin

Replies: 23
Views: 2725

PostForum: Minerals and Mineralogy   Posted: Jan 14, 2025 15:00   Subject: Re: Libyan Desert Glass Structure
Note that cristobalite spherulites with semi-crystalline phases are similar to those observed in crystallography of (bio)polymers.
  Topic: Libyan Desert Glass Structure
Roger Warin

Replies: 23
Views: 2725

PostForum: Minerals and Mineralogy   Posted: Jan 14, 2025 14:58   Subject: Re: Libyan Desert Glass Structure
I was surprised when I found on my photo the Maltese cross that I had already shown you in my photos of luxulianite (UK).
Indeed, spherulites have particular optical properties. Thus, observed under ...
  Topic: Libyan Desert Glass Structure
Roger Warin

Replies: 23
Views: 2725

PostForum: Minerals and Mineralogy   Posted: Jan 14, 2025 14:55   Subject: Re: Libyan Desert Glass Structure
The LDG precursor gel obviously contains traces of the signature of celestial bodies (astrophysicists' famous dark dust). This dark matter is comparable to the very primitive cold carbonaceous chondri ...
 
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