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28 Jan-17:40:26 Re: tucson shows 2022 - mango stuff (Bergur_e_sigurdarson)
28 Jan-17:04:56 Re: tucson shows 2022 (Bob Kerr)
28 Jan-16:52:58 Re: tucson shows 2022 (Bob Kerr)
28 Jan-14:52:52 Re: don lum collection (Don Lum)
28 Jan-14:41:04 Re: don lum collection (Carles Millan)
28 Jan-14:18:44 Re: tucson shows 2022 (Minsur)
28 Jan-13:46:21 Re: don lum collection (Don Lum)
28 Jan-13:42:13 Re: don lum collection (Bob Morgan)
28 Jan-10:16:43 Re: tucson shows 2022 (Bergur_e_sigurdarson)
28 Jan-09:52:10 Re: tucson shows 2022 (Jordi Fabre)
28 Jan-00:09:13 Re: don lum collection (Don Lum)
27 Jan-18:53:28 Re: collection of sante celiberti (Sante Celiberti)
27 Jan-18:07:20 Re: tucson shows 2022 (Bob Kerr)
27 Jan-17:13:53 Re: tucson shows 2022 (Bob Kerr)
27 Jan-16:47:57 Re: tucson shows 2022 (Bob Kerr)
27 Jan-16:33:00 Re: tucson shows 2022 (Bob Kerr)
27 Jan-16:22:17 Re: tucson shows 2022 (Bob Kerr)
27 Jan-16:04:48 Re: tucson shows 2022 (Bob Kerr)
27 Jan-15:04:20 Re: forms involved in titanite crystal (Josele)
27 Jan-14:20:21 Re: alleged 'silvers' from udokan? (Jordi Fabre)
27 Jan-14:17:25 Re: collection of michael shaw (Michael Shaw)
27 Jan-10:56:11 Re: tucson shows 2022 (Joseph Doliveira)
27 Jan-10:52:00 Re: tucson shows 2022 (John S. White)
27 Jan-10:06:30 Re: tucson shows 2022 (Minsur)
27 Jan-10:00:18 Re: forms involved in titanite crystal (Mark Holtkamp)

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  Topic: Possibly hematite?
alfredo

Replies: 8
Views: 376

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Jan 24, 2022 01:07   Subject: Re: Possibly hematite?
The IMA (International Mineralogical Association) only makes official definitions for species, not varieties, so all those varietal names end up with rather fuzzy definitions and you are likely to fin ...
  Topic: Possibly hematite?
alfredo

Replies: 8
Views: 376

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Jan 23, 2022 22:03   Subject: Re: Possibly hematite?
Yes, it certainly does look like hematite. And some of those protruding knobbly hemispheres look like the "kidney ore" or "glaskopf" varieties of hematite: https://www.mindat.org/m ...
  Topic: Using iron and iron oxide as a green fuel
alfredo

Replies: 3
Views: 237

PostForum: Off-Topic and Introductions   Posted: Jan 20, 2022 11:27   Subject: Re: Using iron and iron oxide as a green fuel
re "...a future source of fuel?"

Keep in mind that neither hydrogen gas nor metal powders are a "source" of energy, because they are not freely available in Nature and it takes ...
  Topic: Tucson Shows 2022
alfredo

Replies: 29
Views: 3495

PostForum: News about shows   Posted: Jan 15, 2022 22:46   Subject: Re: Tucson Shows 2022 - It's starting!!
I'm in Tucson now and have already seen early birds arriving from England, Canada, Japan, Morocco... I agree with Bob that visitors will be fewer than in non-pandemic years, but that sales will nevert ...
  Topic: Apophyllite from Brazil - a new find from 2021?
alfredo

Replies: 2
Views: 438

PostForum: Minerals and Mineralogy   Posted: Jan 15, 2022 22:23   Subject: Re: apophyllite from Brazil - a new find from 2021?
I saw a wonderful OLD specimen of apophyllite from that region, but am unaware of any new finds specifically from last year.

However, new finds of the typical trap rock minerals should not be unexp ...
  Topic: Alleged 'silvers' from Udokan?
alfredo

Replies: 11
Views: 1915

PostForum: Off-Topic and Introductions   Posted: Jan 15, 2022 17:32   Subject: Re: Alleged 'silvers' from Udokan?
I completely agree with Bob here. The collectors most likely to fall for fakes are those who try to collect everything from everywhere. A collector had best specialize in a limited geographical area, ...
  Topic: Any ideas on the material appreciated
alfredo

Replies: 6
Views: 599

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Dec 29, 2021 12:47   Subject: Re: Any ideas on the material appreciated
Looks to me more like talc or serpentine, rather than gypsum.
  Topic: Peruvian / French or Cornish Chalcopyrite on Fluorite?
alfredo

Replies: 12
Views: 1115

PostForum: What is it? - Where is it from?   Posted: Dec 29, 2021 11:38   Subject: Re: Peruvian / French or Cornish Chalcopyrite on Fluorite?
"At the moment the French say it cannot be French,"

I do not see this anywhere. The label says France, and Jordi and Makekerowill think it could be France, so why not? In the absence of a ...
  Topic: Peruvian / French or Cornish Chalcopyrite on Fluorite?
alfredo

Replies: 12
Views: 1115

PostForum: What is it? - Where is it from?   Posted: Dec 25, 2021 13:08   Subject: Re: Peruvian / French or Cornish Chalcopyrite on Fluorite?
Although perhaps no sphalerite has been reported in Mont-Roc, I think that considering the presence of the commonly associated minerals pyrite, chalcopyrite, fluorite, barite, etc, the total absence o ...
  Topic: May I get a read
alfredo

Replies: 4
Views: 880

PostForum: What is it? - Where is it from?   Posted: Dec 01, 2021 11:31   Subject: Re: May I get a read
I agree with Bob and Kevin. The density and hardness seem to be wrong. Looks like quartz.
  Topic: Two questions on Bolivian danburite
alfredo

Replies: 8
Views: 5793

PostForum: Minerals and Mineralogy   Posted: Nov 14, 2021 14:42   Subject: Re: Two questions on Bolivian danburite
Vachik, Federico Ahlfeld (after whom the mineral ahlfeldite is named) published a detailed study of Bolivian danburite at the University of Córdoba, Argentina, back in 1946. I have a copy of his paper ...
  Topic: Clinoclase, Boleo, Baja California, Mexico ?
alfredo

Replies: 6
Views: 1676

PostForum: What is it? - Where is it from?   Posted: Oct 27, 2021 04:53   Subject: Re: Clinoclase, Boleo, Baja California, Mexico ?
There is hardly any arsenic in the Boleo district, so clinoclase seems unlikely.
  Topic: Munich Show (Mineralientage) 2021
alfredo

Replies: 27
Views: 7235

PostForum: News about shows   Posted: Oct 26, 2021 15:46   Subject: Re: Munich Show (Mineralientage) 2021
There were only about (guessing) 60% of the usual number of dealers there, which was fine for retail buyers, because even 60% of normal is still way more than you can visit in the time available, and ...
  Topic: Alleged 'silvers' from Udokan?
alfredo

Replies: 11
Views: 1915

PostForum: Off-Topic and Introductions   Posted: Oct 14, 2021 06:03   Subject: Re: Alleged 'silvers' from Udokan?
This reminds me of a recent case from Germany where a dealer made a lot of money selling large pieces of "native brass", zhanghengite, and other extremely rare copper-zinc alloys in previous ...
  Topic: Conditions where pyrite/pyritohedra are formed
alfredo

Replies: 16
Views: 3508

PostForum: Minerals and Mineralogy   Posted: Oct 05, 2021 05:40   Subject: Re: Conditions where pyrite/pyritohedra are formed
Not about pyrite, but I have a very similar old study about galena crystal habits. The authors concluded that octahedral galenas formed at higher temperatures and that lower temperatures resulted in m ...
  Topic: Just how fast can the crystals we love and collect grow?!
alfredo

Replies: 5
Views: 1830

PostForum: Minerals and Mineralogy   Posted: Oct 05, 2021 05:31   Subject: Re: Just how fast can the crystals we love and collect grow?!
Apart from pegmatite environments, I've personally seen specimens (miniatures to cabinet size) of other things growing in less than a month: Sulphur crystals in volcanic fumaroles. Gypsum crystals in ...
  Topic: Location in Romania
alfredo

Replies: 5
Views: 1586

PostForum: What is it? - Where is it from?   Posted: Sep 30, 2021 16:58   Subject: Re: Location in Romania
Yes, Mathias, the "Siebenbürgen" on the label is the old German name for Transylvania.
  Topic: Question about an old specimen
alfredo

Replies: 8
Views: 1750

PostForum: What is it? - Where is it from?   Posted: Sep 27, 2021 11:17   Subject: Re: Question about an old specimen
"Dognecea it was in Hungary but currently is Romania"

Some parts of Hungary are now in Slovakia and Serbia. One Hungarian mineral collector likes to say, "Hungary is the only country ...
  Topic: Will Barite save the world?
alfredo

Replies: 15
Views: 2689

PostForum: Off-Topic and Introductions   Posted: Sep 23, 2021 16:33   Subject: Re: Will Barite save the world?
That can only happen if the inside is hotter than the outside, then it can radiate more than it absorbs, so, if it is 40 degrees outside, the paint can't cool your home to below 40 degrees, otherwise, ...
  Topic: Sold as “Green stilbite”
alfredo

Replies: 11
Views: 2479

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Sep 17, 2021 07:46   Subject: Re: Sold as “Green stilbite”
Certainly looks like heulandite crystals colored by inclusions of celadonite, and almost certainly from a basalt rock rather than a metamorphic rock, but whether it's from Iceland or India or elsewher ...
 
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