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Newest topics and users posts
02 Jun-18:27:15 Re: collection of sante celiberti - a mineralogical trip through italy (Sante Celiberti)
02 Jun-12:40:16 Stay at home - coronavirus / covid-19 - hibiscus (Jordi Fabre)
02 Jun-03:16:14 Re: any interesting minerals from ukraine? (David)
02 Jun-02:04:21 Re: any interesting minerals from ukraine? (Riccardo Modanesi)
02 Jun-01:50:10 Re: any interesting minerals from ukraine? (David)
01 Jun-22:24:16 Re: any interesting minerals from ukraine? (Peter Lemkin)
01 Jun-17:47:51 Re: any interesting minerals from ukraine? (Robert Seitz)
01 Jun-11:16:03 Re: collection of firmo espinar (Firmo Espinar)
01 Jun-06:27:15 Re: any interesting minerals from ukraine? (David)
01 Jun-06:03:02 Re: any interesting minerals from ukraine? (David)
01 Jun-04:01:30 Re: any interesting minerals from ukraine? (Peter Lemkin)
01 Jun-03:34:37 Re: any interesting minerals from ukraine? (Jordi Fabre)
01 Jun-03:14:49 Re: any interesting minerals from ukraine? (David)
01 Jun-00:01:44 Re: collection of volkmar stingl (Volkmar Stingl)
31 May-23:03:51 Re: collection of volkmar stingl (Volkmar Stingl)
31 May-17:20:27 Re: collection of sante celiberti - a mineralogical trip through italy (Sante Celiberti)
31 May-16:31:27 Re: tucson show 2020 (Gail)
31 May-14:27:17 Re: tucson show 2020 (Benj)
31 May-14:12:54 Re: collection of benjamin carballo (Benj)
31 May-14:03:06 Re: collection of benjamin carballo (Don Lum)
31 May-13:49:24 Re: collection of benjamin carballo (Benj)
31 May-13:45:53 Re: collection of benjamin carballo (Benj)
31 May-13:09:46 Re: collection of volkmar stingl (Jordi Fabre)
31 May-13:02:21 Re: collection of volkmar stingl (Volkmar Stingl)
31 May-12:06:19 Re: collection of volkmar stingl (Jordi Fabre)

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  Topic: Altered/modified minerals
alfredo

Replies: 1
Views: 524

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: May 04, 2020 10:54   Subject: Re: Altered/modified minerals
To be classified as a new mineral species it needs to have a different chemical composition and/or a different crystal structure than any previously known mineral species; just having a different appe ...
  Topic: Mines active for mineral specimens only
alfredo

Replies: 9
Views: 5519

PostForum: Mines and Mineral Localities   Posted: Apr 05, 2020 04:56   Subject: Re: Mines active for mineral specimens only
In Bolivia there are several small mines worked exclusively for specimens, like the Tomokoni vivianite mine, the El Desierto sulphur mine, etc.
  Topic: Is this Hematite?
alfredo

Replies: 4
Views: 6279

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Mar 23, 2020 13:27   Subject: Re: Is this Hematite?
If the streak is red, I‘d call them "hematite pseudomorphs after pyrite".
  Topic: Stay at home - Coronavirus / Covid-19
alfredo

Replies: 315
Views: 41909

PostForum: National Library of Spain / Biblioteca Nacional de España (BNE) and FMF   Posted: Mar 15, 2020 16:43   Subject: Re: Stay at home - Coronavirus / Covid-19
Two different internet mineral dealers in the USA reported on Facebook that they were surprised to see their sales have doubled this month from what they normally are this time of year. That does not ...
  Topic: Dealing with damage
alfredo

Replies: 26
Views: 10736

PostForum: Off-Topic and Introductions   Posted: Mar 03, 2020 05:09   Subject: Re: Dealing with damage
Mr Lewinsky is simply blind to the fact that "mineral collecting" is not one hobby but a whole gamut of different hobbies related to each other only by involving minerals. Field collecting i ...
  Topic: Ethical mineral collecting
alfredo

Replies: 10
Views: 6868

PostForum: Off-Topic and Introductions   Posted: Feb 29, 2020 18:16   Subject: Re: Ethical mineral collecting
While I was working in Bolivia for 12 years I remember sporadic attempts by well-meaning but ignorant "do-gooders" to banish children from working in mines. Unfortunately, in all poor countr ...
  Topic: Unidentified green crystal
alfredo

Replies: 21
Views: 7713

PostForum: What is it? - Where is it from?   Posted: Feb 21, 2020 15:09   Subject: Re: Unidentified green crystal
Those gem testers are designed for use on polished gems. They don‘t really work well on rough stones.
But there is another test you can easily do yourself - Fusibility. See description in a Mindat ar ...
  Topic: Building a Great Mineral Collection?
alfredo

Replies: 23
Views: 9393

PostForum: Off-Topic and Introductions   Posted: Feb 19, 2020 13:45   Subject: Re: Building a Great Mineral Collection?
Tobi wrote: "But when I see the prices on U.S. shows, I think building a good collection without being rich is easier here in Europe than in the United States. Sure, world-class specimens demand ...
  Topic: Magnetite or Franklinite?
alfredo

Replies: 5
Views: 5536

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Feb 18, 2020 23:47   Subject: Re: Magnetite or Franklinite?
I can‘t answer your question, Fuss, but I would like to comment that there is no sharp boundary visually or in physical properties between franklinite and magnetite as they are part of a compositional ...
  Topic: The State of Modern Geology
alfredo

Replies: 14
Views: 8802

PostForum: Minerals and Mineralogy   Posted: Feb 16, 2020 16:06   Subject: Re: The State of Modern Geology
Personally I haven‘t noticed any diminution of jobs in the geology or mineralogy fields. As Roger mentioned, lots of geologists nowadays get jobs in the field of Environmental Geology. Also, prices of ...
  Topic: Building a Great Mineral Collection?
alfredo

Replies: 23
Views: 9393

PostForum: Off-Topic and Introductions   Posted: Feb 14, 2020 01:23   Subject: Re: Building a Great Mineral Collection
Keep in mind that in terms of peoples‘ average incomes, mineral specimens are much more affordable today than they were 200 or 300 years ago, when most mineral collectors were members of European roya ...
  Topic: Urgent problem with specimen in post.
alfredo

Replies: 5
Views: 6412

PostForum: Off-Topic and Introductions   Posted: Feb 06, 2020 14:41   Subject: Re: Urgent problem with specimen in post.
To clarify for everyone, the mineral was traveling from the USA to Australia, so the "Biosecurity" problem is Australia‘s issue, not America‘s.
Australia has always been very concerned abou ...
  Topic: Tucson Show 2020
alfredo

Replies: 104
Views: 46324

PostForum: News about shows   Posted: Jan 23, 2020 22:50   Subject: Re: Tucson Show 2020
...In your opinion, what are the main differences between Tucson, Munich, Sainte-Marie?...

Roger, there are of course the logistical difficulties, with Munich and Sainte Marie being more compact, ...
  Topic: Tucson Show 2020
alfredo

Replies: 104
Views: 46324

PostForum: News about shows   Posted: Jan 22, 2020 12:41   Subject: Re: Tucson Show 2020
Only 2 weeks, Bob? Many of the European dealers I know are here for 3 weeks, or more, and I‘m here for 5 weeks this year. It seems to keep on expanding with every decade. As my late mentor Rock Currie ...
  Topic: Display cabinets
alfredo

Replies: 17
Views: 11853

PostForum: Conserving, Preparing and Cleaning Minerals   Posted: Jan 14, 2020 08:51   Subject: Re: Display cabinets
I seem to have a lot of minerals with a green or blue-green color due to iron, for example ludlamite, boracite, and many others. Those minerals seem to look their best under daylight or halogen lights ...
  Topic: Quartz Question
alfredo

Replies: 3
Views: 2931

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Jan 10, 2020 12:01   Subject: Re: Quartz Question
Loran, You won‘t really know how good it is until after you clean it. It might be great... or just a good garden decoration. Either way, an impressive size for a self-found specimen!

If it were min ...
  Topic: Weird rock. Smells STRONG - need help to ID
alfredo

Replies: 17
Views: 4938

PostForum: What is it? - Where is it from?   Posted: Jan 08, 2020 14:02   Subject: Re: Weird rock. Smells STRONG - need help to ID
I fully agree with Tracy. Sulphur (or more accurately sulphur oxides or hydrogen sulphide rather than elemental sulphur itself) has a very strong smell, so it takes only a tiny amount in a rock to not ...
  Topic: Smoky Quartz or Smoky Glass?
alfredo

Replies: 21
Views: 5005

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Jan 03, 2020 14:45   Subject: Re: Smokey Quartz or Smokey Glass?
"Whether the example is quartz or glass is largely irrelevant. The example has been made into a knick-knack and, if quartz, probably has been further tampered with by probable irradiation. Minera ...
  Topic: Can someone please identify these for me, please.
alfredo

Replies: 4
Views: 2006

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Jan 03, 2020 05:11   Subject: Re: Can someone please identify these for me, please.
White massive quartz, stained with hematite and/or other iron oxides.
  Topic: A blue obelisk that I'm not sure what it's made from
alfredo

Replies: 6
Views: 1992

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Jan 02, 2020 05:19   Subject: Re: A blue obelisk that I'm not sure what it's made from
"114g Rare Tanzanite Fire Elestial Monatomic andara Crystal Arcturian point"
Let‘s study this description:

114g = a factual statement of the weight, probably true.
Rare = a matter of op ...
 
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