FMF - Friends of Minerals Forum, discussion and message board

I am collecting my photos for this description of the LDG.

There is no poetry in LDG.
It is a silica glass with 98% SiO2.
Of course, since this siliceous phase was extracted from sandstones by very hot water from a comet falling about 28 million years ago, ...

Boron is a strange chemical element. Very oxyphilic, it is the first competitor of silicon, even in dishwashers!
It can participate in astonishing crystalline structures provided that there is no sil ...

Hi,
Tektites are rocks melted by the impact of a large meteorite.
For this, the components of the rock must be fusible, without going through a dissolution in hydrothermal water like chalcedonies an ...

Thank you for this important remark, because there are cases where doubt remains.
One of my friends gave a talk at our club about a few gems including tanzanite.
If you wish, I can send you this art ...

Hello, about tanzanite pleochroism

I enjoyed doing this little manipulation (“manip”), as they say in chemistry.
On my last visit to the Mineralientage (Munich), I didn’t only see Masterpieces.
I ...

Thank you for your clarification.

Hello,
The recent Mineral Show in Liege was a success. On this occasion, some minerals from the famous André Rostenne collection were presented by the Natural History Museum of Luxembourg.
Here is a ...

Hello,
Back from Munich, with a few avatars with my car (I like progress when it is reliable), I present to you some memories of a wonderful visit. Firstly, was the Sonderschau, the thematic exhibiti ...

Pezzottaite
Pezzottaite is rhombohedral and it is not a Cs-rich beryl but a new mineral species closely related to beryl, with 15% Cs.
Morganite (a variety of beryl) tolerates a maximum of 3% Cs. Th ...

Hello,
I hope my reply will be relevant. As a reader and subscriber since the 1st issue of Règne Minéral (as well as the Mineralogical Record), I know this 'bedside and office' magazine well.
From ...

I am surprised by these hesitations.
It seems obvious to me that the morphology of this crystal and its appearance say that it is a tourmaline.
I think it is Malagasy.
The distinction between the 2 ...

This sample must have been collected in 1907-1908.
My respect for Ungemach is immense. He could not have been mistaken.
He was the main associate of Georges Friedel in Strasbourg.
He gave his colle ...

Hello
Here is a very rare mineral, so much so that Mindat is unaware of its Mexican origin.
It is in Mexico that Henri Ungemach found it, but where?

Sorry, Jordi,
I see a ternary axis. So it's a tourmaline, which is not unusual for the locality
probably Mount Ibity Area.

Author	Message
Topic: Libyan Desert Glass Structure
Roger Warin Replies: 12 Views: 670	Forum: Minerals and Mineralogy Posted: Jan 13, 2025 01:10 Subject: Re: Libyan Desert Glass Structure
Roger Warin Replies: 12 Views: 670	I am collecting my photos for this description of the LDG.
Topic: Libyan Desert Glass Structure
Roger Warin Replies: 12 Views: 670	Forum: Minerals and Mineralogy Posted: Jan 11, 2025 14:58 Subject: Re: Libyan Desert Glass Structure
Roger Warin Replies: 12 Views: 670	There is no poetry in LDG. It is a silica glass with 98% SiO2. Of course, since this siliceous phase was extracted from sandstones by very hot water from a comet falling about 28 million years ago, ...
Topic: Contribution Dr. Menor-Salván - The spectacular borates of Shijiangshan, Mongolia - (54)
Roger Warin Replies: 3 Views: 566	Forum: Featured Columns of FMF Posted: Dec 29, 2024 14:10 Subject: Re: Contribution Dr. Menor-Salván - The spectacular borates of Shijiangshan, Mongolia - (5
Roger Warin Replies: 3 Views: 566	Boron is a strange chemical element. Very oxyphilic, it is the first competitor of silicon, even in dishwashers! It can participate in astonishing crystalline structures provided that there is no sil ...
Topic: Tektite ?
Roger Warin Replies: 5 Views: 880	Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Dec 11, 2024 08:27 Subject: Re: Tektite ?
Roger Warin Replies: 5 Views: 880	Hi, Tektites are rocks melted by the impact of a large meteorite. For this, the components of the rock must be fusible, without going through a dissolution in hydrothermal water like chalcedonies an ...
Topic: Tanzanite pleochroism
Roger Warin Replies: 3 Views: 789	Forum: Minerals and Mineralogy Posted: Dec 06, 2024 15:25 Subject: Re: Tanzanite pleochroism
Roger Warin Replies: 3 Views: 789	Thank you for this important remark, because there are cases where doubt remains. One of my friends gave a talk at our club about a few gems including tanzanite. If you wish, I can send you this art ...
Topic: Tanzanite pleochroism
Roger Warin Replies: 3 Views: 789	Forum: Minerals and Mineralogy Posted: Nov 27, 2024 09:56 Subject: Tanzanite pleochroism
Roger Warin Replies: 3 Views: 789	Hello, about tanzanite pleochroism I enjoyed doing this little manipulation (“manip”), as they say in chemistry. On my last visit to the Mineralientage (Munich), I didn’t only see Masterpieces. I ...
Topic: INTERMINERAL Liège 2024
Roger Warin Replies: 5 Views: 1803	Forum: Mineral Shows Posted: Nov 06, 2024 00:02 Subject: Re: INTERMINERAL Liège 2024
Roger Warin Replies: 5 Views: 1803	Thank you for your clarification.
Topic: INTERMINERAL Liège 2024
Roger Warin Replies: 5 Views: 1803	Forum: Mineral Shows Posted: Nov 05, 2024 15:17 Subject: INTERMINERAL Liège 2024
Roger Warin Replies: 5 Views: 1803	Hello, The recent Mineral Show in Liege was a success. On this occasion, some minerals from the famous André Rostenne collection were presented by the Natural History Museum of Luxembourg. Here is a ...
Topic: Munich Show (Mineralientage) 2024
Roger Warin Replies: 9 Views: 3939	Forum: News about Shows Posted: Oct 29, 2024 23:45 Subject: My 44th visit to the Mineralientage in Munich since 1977
Roger Warin Replies: 9 Views: 3939	Hello, Back from Munich, with a few avatars with my car (I like progress when it is reliable), I present to you some memories of a wonderful visit. Firstly, was the Sonderschau, the thematic exhibiti ...
Topic: Pezzottaite, new specimens
Roger Warin Replies: 1 Views: 1619	Forum: Minerals and Mineralogy Posted: Oct 17, 2024 13:54 Subject: Pezzottaite, new specimens
Roger Warin Replies: 1 Views: 1619	Pezzottaite Pezzottaite is rhombohedral and it is not a Cs-rich beryl but a new mineral species closely related to beryl, with 15% Cs. Morganite (a variety of beryl) tolerates a maximum of 3% Cs. Th ...
Topic: Le Règne Minéral magazine closes
Roger Warin Replies: 3 Views: 2427	Forum: Le Règne Minéral Posted: Sep 03, 2024 07:54 Subject: Re: Le Règne Minéral magazine closes
Roger Warin Replies: 3 Views: 2427	Hello, I hope my reply will be relevant. As a reader and subscriber since the 1st issue of Règne Minéral (as well as the Mineralogical Record), I know this 'bedside and office' magazine well. From ...
Topic: what is this? A purple tourmaline grown out from the base of a skeletal quartz?
Roger Warin Replies: 8 Views: 2523	Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Aug 28, 2024 14:59 Subject: Re: what is this? A purple tourmaline grown out from the base of a skeletal quartz?
Roger Warin Replies: 8 Views: 2523	I am surprised by these hesitations. It seems obvious to me that the morphology of this crystal and its appearance say that it is a tourmaline. I think it is Malagasy. The distinction between the 2 ...
Topic: Moschellandsbergite / Wow !
Roger Warin Replies: 3 Views: 1732	Forum: Minerals and Mineralogy Posted: Aug 17, 2024 15:00 Subject: Re: Moschellandsbergite / Wow !
Roger Warin Replies: 3 Views: 1732	This sample must have been collected in 1907-1908. My respect for Ungemach is immense. He could not have been mistaken. He was the main associate of Georges Friedel in Strasbourg. He gave his colle ...
Topic: Moschellandsbergite / Wow !
Roger Warin Replies: 3 Views: 1732	Forum: Minerals and Mineralogy Posted: Aug 17, 2024 09:33 Subject: Moschellandsbergite / Wow !
Roger Warin Replies: 3 Views: 1732	Hello Here is a very rare mineral, so much so that Mindat is unaware of its Mexican origin. It is in Mexico that Henri Ungemach found it, but where?
Topic: what is this? A purple tourmaline grown out from the base of a skeletal quartz?
Roger Warin Replies: 8 Views: 2523	Forum: FOR BEGINNERS: What is it? Where is it from? Posted: Aug 14, 2024 14:35 Subject: Re: what is this? A purple tourmaline grown out from the base of a skeletal quartz?
Roger Warin Replies: 8 Views: 2523	Sorry, Jordi, I see a ternary axis. So it's a tourmaline, which is not unusual for the locality probably Mount Ibity Area.