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Newest topics and users posts
04 Aug-07:59:31 Re: collection of volkmar stingl (Volkmar Stingl)
04 Aug-07:17:26 Re: advice needed on how to get started on a potential project. (Kushmeja)
04 Aug-05:50:34 Re: advice needed on how to get started on a potential project. (Peter Lemkin)
04 Aug-04:34:30 Advice needed on how to get started on a potential project. (Smurfstuff)
03 Aug-14:18:07 Re: tsumeb - deposit of dioptase on calcite. (Roger Warin)
03 Aug-13:05:21 Re: collection of volkmar stingl (Volkmar Stingl)
03 Aug-11:36:18 Re: tsumeb - deposit of dioptase on calcite. (Steveb)
03 Aug-10:56:32 Tsumeb - deposit of dioptase on calcite. (Roger Warin)
03 Aug-07:01:45 Re: stay at home - coronavirus / covid-19 (Peter Lemkin)
02 Aug-23:55:17 Re: collection of volkmar stingl (Volkmar Stingl)
02 Aug-23:11:49 Re: don lum collection (Don Lum)
02 Aug-10:20:30 Re: stay at home - coronavirus / covid-19 (Roger Warin)
02 Aug-09:15:31 Re: collection of michael shaw (Michael Shaw)
02 Aug-00:58:34 Re: stay at home - coronavirus / covid-19 (Peter Lemkin)
01 Aug-14:31:32 Re: stay at home - coronavirus / covid-19 (Don Lum)
01 Aug-14:24:20 Re: stay at home - coronavirus / covid-19 (Riccardo Modanesi)
01 Aug-14:21:52 Re: collection of sante celiberti (Jordi Fabre)
01 Aug-09:27:00 Re: corona covid-19 virus - what is it ? where is it from ? (Roger Warin)
01 Aug-07:15:53 Re: collection of volkmar stingl (Volkmar Stingl)
01 Aug-06:48:22 Re: corona covid-19 virus - what is it ? where is it from ? (Peter Lemkin)
01 Aug-04:45:19 Re: corona covid-19 virus - what is it ? where is it from ? (R Saunders)
31 Jul-22:40:40 Corona covid-19 virus - what is it ? where is it from ? (Roger Warin)
31 Jul-16:32:56 Re: collection of firmo espinar (Firmo Espinar)
30 Jul-14:58:22 Re: melanophlogite? (Luiz Oliveira)
30 Jul-14:51:23 Re: about a rutile epitaxy on hematite in quartz (Roger Warin)

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  Topic: Aura Coating
lluis

Replies: 15
Views: 1984

PostForum: Incorrect classification and fakes   Posted: Jun 06, 2021 09:09   Subject: Re: Aura Coating
Hi, John

Agreed with you that is titanium coating..
That hydrochloric acid will take it out, well, maybe,,,,or maybe not...

I would suggest to treat with nitric acid, but that is dangerous (yel ...
  Topic: Airtight display boxes ?
lluis

Replies: 14
Views: 1666

PostForum: Conserving, Preparing and Cleaning Minerals   Posted: May 25, 2021 08:54   Subject: Re: Airtight display boxes ?
Hi, Cascaillou

For what you are asking for, I think that you ask maybe for much too much...

I live at seaside (say, around 200 meters beach), and it is very humid.
I have villiaumite in a Jousi ...
  Topic: Price changes
lluis

Replies: 16
Views: 2421

PostForum: Off-Topic and Introductions   Posted: Apr 25, 2021 13:28   Subject: Re: Price changes
Maybe following dear Bergur..

When I was a child in 1960's, a ticket of metro, go and return, costed me 50 centimes (of peseta....), A ticket of bus, any something so astronomical as 50 cents of a ...
  Topic: Synthetic smoky quartz?
lluis

Replies: 11
Views: 1510

PostForum: Minerals and Mineralogy   Posted: Apr 11, 2021 14:01   Subject: Re: Synthetic smoky quartz?
I think as James: probably natural, maybe irradiated (man created smoky quartz).
I think irradiated

With best wishes

LLuís
  Topic: Natural or man-made?
lluis

Replies: 6
Views: 1567

PostForum: What is it? - Where is it from?   Posted: Mar 13, 2021 09:32   Subject: Re: Natural or man-made?
As John says, it looks very natural...
Just Chinese turquoise tends to get greener in short time (opposite to Persian one)...

It depends on price.... If bought for nothing, well, probably man made ...
  Topic: Creedite - Is Pink Different than Purple, Navidad Mine (Mina Navidad)
lluis

Replies: 9
Views: 2184

PostForum: Minerals and Mineralogy   Posted: Mar 10, 2021 10:58   Subject: Re: Creedite - Is Pink Different than Purple, Navidad Mine (Mina Navidad)
And to add a little more, Mn2+ and Mn3+ could be assessed by spectroscopy...

Not to be done at home, but easy to do in a lab with such devices, as likely a University would have....

With best wi ...
  Topic: Creedite - Is Pink Different than Purple, Navidad Mine (Mina Navidad)
lluis

Replies: 9
Views: 2184

PostForum: Minerals and Mineralogy   Posted: Mar 10, 2021 04:21   Subject: Re: Creedite - Is Pink Different than Purple, Navidad Mine (Mina Navidad)
I think anyone in the analysis department of Chemistry in any University near where you live...

At least, that is what I would do...

With best wishes

Lluís
  Topic: Creedite - Is Pink Different than Purple, Navidad Mine (Mina Navidad)
lluis

Replies: 9
Views: 2184

PostForum: Minerals and Mineralogy   Posted: Mar 09, 2021 13:54   Subject: Re: Creedite - Is Pink Different than Purple, Navidad Mine (Mina Navidad)
Hi, Julie

I am thinking it is just a difference due to manganese acting as colour giver,,,
Mn2+-Mn3+ could act as colour centers... Differences in concentration between them and in all could cause ...
  Topic: Beautiful durable and...common?
lluis

Replies: 8
Views: 2841

PostForum: Off-Topic and Introductions   Posted: Mar 04, 2021 03:03   Subject: Re: Beautiful durable and...common?
Dear Steve

I fear that if you may buy an incredible rare roman gold coin, 2000 years old as gold bullion, well, probably would get anything labeled as ancient roman incredibly rare 2000 years old r ...
  Topic: Heat changes some minerals - how?
lluis

Replies: 11
Views: 2261

PostForum: Off-Topic and Introductions   Posted: Jan 30, 2021 09:24   Subject: Re: Heat changes some minerals - how?
Dear Alfredo,

Good point!
But, that is simply vapour pressure... Water evaporates because it tries to get the equilibrium with humidity in air. Done that air moves, it continues evaporating trying ...
  Topic: Heat changes some minerals - how?
lluis

Replies: 11
Views: 2261

PostForum: Off-Topic and Introductions   Posted: Jan 29, 2021 15:52   Subject: Re: Heat changes some minerals - how?
Dear Alfredo

Losing salt, NaCl, common salt, kitchen salt, by heating, well, it is very hard....
Boiling point for it is 1465ºC. And if in a compound, probably higher....

On the other hand, as ...
  Topic: Heat changes some minerals - how?
lluis

Replies: 11
Views: 2261

PostForum: Off-Topic and Introductions   Posted: Jan 29, 2021 13:28   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: Heat changes some minerals - how?
lluis

Replies: 11
Views: 2261

PostForum: Off-Topic and Introductions   Posted: Jan 29, 2021 10:39   Subject: Re: Heat changes some minerals - how?
Dear Tom,

In case composition should not be altered, then it is simply a change among different forms stable at different temperatures....

If you raise the temperature, you would get the form th ...
  Topic: What type of mineral is this, or maybe a fossil?
lluis

Replies: 11
Views: 2217

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Jan 29, 2021 10:34   Subject: Re: What type of mineral is this, or maybe a fossil?
`Hi, Rumpeltroll (any name? Troll uses to mean nothing nice in Internet, and to sign uses to be considered polite. Say me old fashioned....)

Mattias said what is already (maybe in sensu lato...) in ...
  Topic: Chromium in jewels
lluis

Replies: 3
Views: 1658

PostForum: Off-Topic and Introductions   Posted: Jan 25, 2021 13:04   Subject: Re: Chromium in jewels
Interesting question...

Answer

For red in ruby
http://www.webexhibits.org/causesofcolor/6AA.html
(link normalized by FMF)

For green in emerald
http://www.webexhibits.org/causesofcolor/6AB. ...
  Topic: Beautiful durable and...common?
lluis

Replies: 8
Views: 2841

PostForum: Off-Topic and Introductions   Posted: Jan 12, 2021 15:09   Subject: Re: Beautiful durable and...common?
Hi, Tom

Some are certainly common, at least depending on you define "common"...
Citrines are bought by the Kg (well, by carat, but in big bags... And not the burnt amethysts... But citri ...
  Topic: Pink Jade?
lluis

Replies: 4
Views: 1379

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Jan 11, 2021 14:40   Subject: Re: Pink Jade?
Hi, Foreman (any name? Sorry, but I feel dumb addressing to a nickname....)

Without more data, and reading Mindat, it could the purplish-blue/violet variety of Jadeite...
https://www.mindat.org/mi ...
  Topic: New text on the FMF
lluis

Replies: 6
Views: 2234

PostForum: Mines and Mineral Localities   Posted: Jan 04, 2021 10:41   Subject: Re: New text on the FMF
Dear All

What they said that because named in FMF, access is granted, is simply an lie in Spain: owner should give permission if you wish to dig there for minerals.
That many do not do, by sure, b ...
  Topic: Names for green or yellow corundum (sapphire)
lluis

Replies: 5
Views: 1931

PostForum: Off-Topic and Introductions   Posted: Dec 26, 2020 12:27   Subject: Re: Names for green or yellow sapphire
Completely agreed with Fiebre Verde.

I worked in a gems dealer. I had been in contact with gem dealers in spain. Never have seen any padparascha one... And I was trying to find any I could afford.. ...
  Topic: Odd textures on this large beryl
lluis

Replies: 10
Views: 3561

PostForum: Minerals and Mineralogy   Posted: Nov 24, 2020 11:53   Subject: Re: Odd textures on this large beryl
Hi, All

I think, if that serves for anything, that what says Duncan, etching, is the answer. Just I maybe differ in I think that could be an etching in preferential faces, as is seen in many other ...
 
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