We use cookies to show content based on your preferences. If you continue to browse you accept their use and installation. More information. >

FMF - Friends of Minerals Forum, discussion and message board
The place to share your mineralogical experiences


Spanish message board






Newest topics and users posts
20 Jun-15:26:42 Re: a mineralogical trip through italy by sante celiberti (Sante Celiberti)
20 Jun-15:18:37 Re: favourite barytes? (Bob Harman)
20 Jun-14:06:36 Re: virtual shows: what's the concept? (Cascaillou)
19 Jun-15:10:35 Re: a mineralogical trip through italy by sante celiberti (Sante Celiberti)
19 Jun-12:45:26 Re: collection of volkmar stingl (Volkmar Stingl)
18 Jun-13:54:07 Re: virtual shows: what's the concept? (Bob Harman)
18 Jun-12:05:04 Re: virtual shows: what's the concept? (James Catmur)
18 Jun-10:14:30 Re: where can i find some bio on gilbert gauthier? (Roger Warin)
18 Jun-08:55:35 Virtual shows: what's the concept? (Cascaillou)
18 Jun-06:55:44 Re: mineral spirituality? (Cascaillou)
17 Jun-22:41:26 Re: collection of volkmar stingl (Volkmar Stingl)
17 Jun-22:09:17 Re: don lum collection (Volkmar Stingl)
17 Jun-17:03:23 Re: don lum collection (Don Lum)
17 Jun-16:11:13 Re: the mizunaka collection - quartz (Am Mizunaka)
17 Jun-15:57:24 Re: where can i find some bio on gilbert gauthier? (Pub1tzu)
17 Jun-15:44:54 Re: a mineralogical trip through italy by sante celiberti (Sante Celiberti)
17 Jun-15:25:33 Re: collection of firmo espinar (Firmo Espinar)
17 Jun-15:21:33 Re: where can i find some bio on gilbert gauthier? (Jordi Fabre)
17 Jun-13:17:18 Re: mineral specimens with inclusions (Eck Noch)
17 Jun-13:15:34 Re: mineral specimens with inclusions - (28) (Eck Noch)
17 Jun-13:12:21 Re: mineral specimens with inclusions - (28) (Eck Noch)
17 Jun-12:10:36 Re: where can i find some bio on gilbert gauthier? (Max Merlo)
17 Jun-10:44:55 Where can i find some bio on gilbert gauthier? (Pub1tzu)
17 Jun-10:33:34 Re: favourite quartzes? (Eck Noch)
17 Jun-10:18:06 Re: favourite quartzes? (Eck Noch)

For lists of newest topics and postings click here


RSS RSS

View unanswered posts

Why and how to register

Index Index
 FAQFAQ RegisterRegister  Log inLog in
 {Forgotten your password?}Forgotten your password?  

Like
83124


The time now is Jun 20, 2021 20:57

Search for a textSearch for a text   

A general guide for using the Forum with some rules and tips
The information provided within this Forum about localities is only given to allow reference to them. Any visit to any of the localities requires you to obtain full permission and relevant information prior to your visit. FMF is strictly against any illicit activities related to collecting minerals.
Search found 356 matches
Index
Author Message
  Topic: Aura Coating
Riccardo Modanesi

Replies: 15
Views: 1334

PostForum: Incorrect classification and fakes   Posted: Jun 06, 2021 14:38   Subject: Re: Aura Coating
Hi to everybody!
Many years ago I was presented a fake amethyst quartz bought in Morocco by my girl-friend and her parents. I treated it with normal ethylic denaturated alcohol and... the paint got a ...
  Topic: Stay at home - Coronavirus / Covid-19
Riccardo Modanesi

Replies: 350
Views: 108884

PostForum: National Library of Spain / Biblioteca Nacional de España (BNE) and FMF   Posted: May 30, 2021 14:57   Subject: Re: Stay at home - Coronavirus / Covid-19
Hi to everybody!
Here in Italy the situation is slowly improving, TOO slowly in my opinion. I got the first inoculation (AstraZeneca) on March 14 and I should get the second one next Sunday. Then... ...
  Topic: A new mineral: alpha-calcium formate
Riccardo Modanesi

Replies: 9
Views: 1257

PostForum: Minerals and Mineralogy   Posted: May 03, 2021 12:40   Subject: Re: A new mineral: alpha-calcium formate
Hi to everybody!
There are plenty of minerals taking an organic or metallorganic origin: coronene, urea, whewellite, zanazziite are just some examples of them!
Greetings from Italy by Riccardo.
  Topic: How does color treating "work"?
Riccardo Modanesi

Replies: 6
Views: 749

PostForum: Off-Topic and Introductions   Posted: Apr 24, 2021 10:32   Subject: Re: How does color treating "work"?
Hi to everybody!
There is a lot of literature concerning gemstone treatments, like diamonds. quartzes. topazes. corundums, beryls etc. A typical case is their so- called "Maxixe-beryl, which los ...
  Topic: Sainte-Marie-aux-Mines 2021 cancelled
Riccardo Modanesi

Replies: 6
Views: 1137

PostForum: Mineral Shows   Posted: Apr 13, 2021 03:49   Subject: Re: Sainte-Marie-aux-Mines 2021 cancelled
Hi to everybody!
OK, let's cheer up! I got my first inoculation (AstraZeneca) on last March 14 and now I'm waiting to be called for the second one, it should be within May or early June. And let's ch ...
  Topic: Does Chevron Amethyst Turn Green When Heated?
Riccardo Modanesi

Replies: 1
Views: 642

PostForum: What is it? - Where is it from?   Posted: Apr 01, 2021 08:14   Subject: Re: Does Chevron Amethyst Turn Green When Heated?
Hi to everybody!
Ok, the biggest majority of prasiolites in trade are heated or treated amethysts, as well as the biggest majority of citrines. Nevertheless, some prasiolites like the Polish (Silesia ...
  Topic: Natural or man-made?
Riccardo Modanesi

Replies: 6
Views: 1427

PostForum: What is it? - Where is it from?   Posted: Mar 13, 2021 14:15   Subject: Re: Natural or man-made?
Hi to everybody!
An opinion: the single pale blue/greenish pieces are natural turquoise, but I'm afraid it is a "reconstructed" one, i.e. the pieses are joined together by artificial glue o ...
  Topic: Any opinions?
Riccardo Modanesi

Replies: 4
Views: 1446

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Feb 15, 2021 14:27   Subject: Re: Any opinions?
I can suggest you to see the inclusions, they are decisive to see whether a gemstone is natural, synthetic or treated. I'm afraid they are at least treated, just by seeing the photos.
Greetings from ...
  Topic: Any opinions?
Riccardo Modanesi

Replies: 4
Views: 1446

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Feb 10, 2021 14:36   Subject: Re: Any opinions?
Hi Beau!
My advice is: you should take a manual of gemmology and see the inclusions of these gemstones by a microscope. Moreover you can take a good refractometer (I can't tell the prices here, but I ...
  Topic: Heat changes some minerals - how?
Riccardo Modanesi

Replies: 11
Views: 2070

PostForum: Off-Topic and Introductions   Posted: Jan 30, 2021 13:11   Subject: Re: Heat changes some minerals - how?
Dear Peter

If mineral lose water, well, maybe pickish chemist, but changed also composition,
Which is one of the things Tom said that should not be..
Loosing water, reduction, oxidation are thin ...
  Topic: What type of mineral is this, or maybe a fossil?
Riccardo Modanesi

Replies: 11
Views: 1975

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Jan 29, 2021 11:53   Subject: Re: What type of mineral is this, or maybe a fossil?
Hi to everybody!
Belemnites or some other mollusks are not to be excluded. They might be elongated shells as well!
Greetings from Italy by Riccardo.
  Topic: Heat changes some minerals - how?
Riccardo Modanesi

Replies: 11
Views: 2070

PostForum: Off-Topic and Introductions   Posted: Jan 29, 2021 11:49   Subject: Re: Heat changes some minerals - how?
Hi to everybody!
Some years ago in Idar-Oberstein my work group and myself made an experiment with three gemstones: a brownish topaz, a gray zoisite and an amethyst quartz. After heat treatment they ...
  Topic: Chromium in jewels
Riccardo Modanesi

Replies: 3
Views: 1544

PostForum: Off-Topic and Introductions   Posted: Jan 26, 2021 05:07   Subject: Re: Chromium in jewels
Hi to everybody!
The difference is due to different combinatons and coordinations of chrome with other elements. Andradite, grossular and uvarovite garnets get green (uvarovite, demantoid and tsavori ...
  Topic: Mysterious Red Pyramids in Mexican opal
Riccardo Modanesi

Replies: 8
Views: 1967

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Jan 21, 2021 06:14   Subject: Re: Mysterious Red Pyramids in Mexican opal
Hi to everybody!
Rutile and hematite inclusions are not to be excluded as well! Some opals contain these minerals as inclusion as well!
Greetings from Italy by Riccardo.
  Topic: Synthetic rubies and shortwave UV
Riccardo Modanesi

Replies: 2
Views: 1305

PostForum: Off-Topic and Introductions   Posted: Jan 20, 2021 13:48   Subject: Re: Synthetic rubies and shortwave UV
Hi to everybody!
Pay attention: synthetic rubies are nowadays made in such a similar way to natural processes, that it's sometimes very difficult to distinguish them from natural stones! Ramaura synt ...
  Topic: Stay at home - Coronavirus / Covid-19
Riccardo Modanesi

Replies: 350
Views: 108884

PostForum: National Library of Spain / Biblioteca Nacional de España (BNE) and FMF   Posted: Jan 11, 2021 15:33   Subject: Re: Stay at home - Coronavirus / Covid-19
Hi to everybody!
Here in Italy it's strictly compulsory to wear a mask covering mouth and nose, and it's compulsory to respect an interpersonal distance of at least 1 metre. Nevertheless we have at l ...
  Topic: Where does this agate come from?
Riccardo Modanesi

Replies: 8
Views: 2374

PostForum: What is it? - Where is it from?   Posted: Jan 04, 2021 08:28   Subject: Re: Where does this agate come from?
Hi to everybody!
Agates are beautiful, but very common as a mineral or quartz variety, Deducing an origin from observing a specimen and/or a photo is almost impossible. Fully agree with James.
Greet ...
  Topic: Natural heat treating
Riccardo Modanesi

Replies: 8
Views: 2291

PostForum: Off-Topic and Introductions   Posted: Dec 27, 2020 03:34   Subject: Re: Natural heat treating
Hi to everybody!
A Bunsen flame is normally used to treat gemstones by heating. It works with pale brown topazes (turning to pink), amethysts (turned to citrine) and weak grey tanzanites (turning to ...
  Topic: Names for green or yellow corundum (sapphire)
Riccardo Modanesi

Replies: 5
Views: 1815

PostForum: Off-Topic and Introductions   Posted: Dec 26, 2020 12:27   Subject: Re: Names for green or yellow sapphire
... and be careful with padparadscha! Many of them are beryl-treated corundums!
Greetings once again by Riccardo.
  Topic: Names for green or yellow corundum (sapphire)
Riccardo Modanesi

Replies: 5
Views: 1815

PostForum: Off-Topic and Introductions   Posted: Dec 26, 2020 12:26   Subject: Re: Names for green or yellow sapphire
Hi to everybody!
As a gemmologist I was educated at the German Gemmological Association in Idar-Oberstein. Their motto is: "no chrome no ruby, no chrome no emerald". It means if you don't s ...
 
Page 1 of 18 Goto page 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18  Next
All times are GMT - 5 Hours
Jump to:  


All pictures, text, design © Forum FMF 2006-2021


Powered by FMF