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Newest topics and users posts
22 Oct-21:25:02 Re: don lum collection (Don Lum)
22 Oct-20:17:40 Re: new mineral discovery (Rickymactal)
22 Oct-20:13:53 Re: new mineral discovery (Kevin Conroy)
22 Oct-19:09:28 Re: new mineral discovery (Rickymactal)
22 Oct-18:09:46 Re: new mineral discovery (Rickymactal)
22 Oct-18:07:06 Re: new mineral discovery (Rickymactal)
22 Oct-16:36:38 Re: new generation for picture - ploum (Ploum)
22 Oct-15:08:03 Re: collection of sante celiberti - a mineralogical trip through italy (Sante Celiberti)
22 Oct-11:52:59 Re: the mizunaka collection (Am Mizunaka)
22 Oct-09:53:49 Re: older specimens with poor and sometimes mixed up labels (Pete Richards)
22 Oct-08:43:12 Re: older specimens with poor and sometimes mixed up labels (Michael Shaw)
22 Oct-08:32:55 Re: older specimens with poor and sometimes mixed up labels (Kevin Conroy)
22 Oct-06:46:34 Re: older specimens with poor and sometimes mixed up labels (R Saunders)
22 Oct-05:18:18 Re: older specimens with poor and sometimes mixed up labels (James Catmur)
22 Oct-01:09:27 Re: crystal cluster?? (Jlea80)
22 Oct-00:58:10 Re: older specimens with poor and sometimes mixed up labels (Tobi)
22 Oct-00:55:46 Re: crystal cluster?? (Bob Harman)
22 Oct-00:39:05 Re: collection of sante celiberti - a mineralogical trip through italy (Tobi)
22 Oct-00:36:16 Re: crystal cluster?? (Tobi)
21 Oct-23:56:41 Re: the mizunaka collection (Don Lum)
21 Oct-23:21:53 The mizunaka collection - fluorite (Am Mizunaka)
21 Oct-22:52:17 Crystal cluster?? (Jlea80)
21 Oct-20:41:36 Older specimens with poor and sometimes mixed up labels (Pete Richards)
21 Oct-17:20:36 Re: new generation for picture - ploum (Ploum)
21 Oct-15:54:23 Re: uraninite storage (Cascaillou)

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  Topic: Smoky or Smokey
alfredo

Replies: 21
Views: 2357

PostForum: Off-Topic and Introductions   Posted: Sep 28, 2019 20:20   Subject: Re: Smoky or Smokey
Whichever you prefer. (I use smoky myself.)
  Topic: Presentation of new members - Reference Thread
alfredo

Replies: 411
Views: 230287

PostForum: Off-Topic and Introductions   Posted: Sep 26, 2019 23:57   Subject: Re: Presentation of new members - Stephan W. Koch mostly in Tucson
Stephan, welcome to our forum! We hope you enjoy the discussions with friendly mineral collectors here (plus a couple of cantankerous ones, but interesting people nevertheless).
  Topic: First Post, Black Specimen
alfredo

Replies: 8
Views: 624

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Sep 04, 2019 16:02   Subject: Re: First Post, Black Specimen
Daniel, I‘m pretty sure your black rock is one of the many forms of silica, either a chert or jasper, and not obsidian. (Obsidian can only exist in geologically relatively young volcanic areas, as it ...
  Topic: Inclusions in Peña Blanca quartz?
alfredo

Replies: 4
Views: 449

PostForum: Minerals and Mineralogy   Posted: Aug 31, 2019 05:53   Subject: Re: Incusions in Peña Blanca quartz?
No, not the yellow tipped ones. The ones I have are clear on the tips and have the fibres in the bottom half of the quartz crystals, together with some micaceous mineral which gives the XRD pattern o ...
  Topic: Inclusions in Peña Blanca quartz?
alfredo

Replies: 4
Views: 449

PostForum: Minerals and Mineralogy   Posted: Aug 31, 2019 03:06   Subject: Re: Incusions in Peña Blanca quartz?
I had some from here that I was convinced were fibrous amphibole, based on their appearance under the microscope, but Dr George Rossman at Caltech studied them and said they were just hollow tubes. Th ...
  Topic: What is this mineral?
alfredo

Replies: 3
Views: 450

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Jul 31, 2019 16:59   Subject: Re: What is this mineral?
I vote for opal, based on the luster of the fracture surface, and having found stuff with very similar color and luster in Idaho that turned out to be common opal.

With the amount of it you‘re mini ...
  Topic: Uraninite storage
alfredo

Replies: 32
Views: 2240

PostForum: Conserving, Preparing and Cleaning Minerals   Posted: Jul 30, 2019 00:44   Subject: Re: Uraninite storage
Geological age is another consideration, Jesse. In recently formed secondaries, like the liebigite from the Schwartzwalder mine, there aren‘t many daughter products, just the uranium, chemically separ ...
  Topic: Certificates of authenticity for analyzed rare mineral specimens
alfredo

Replies: 7
Views: 773

PostForum: Minerals and Mineralogy   Posted: Jul 29, 2019 20:29   Subject: Re: Certificates of authenticity for analyzed rare mineral specimens
Continuing in my role as wet blanket and general all round curmudgeon...
A "certificate of authenticity" is only as good as the amount of study that goes into it. Sometimes an EDS analysis ...
  Topic: Uraninite storage
alfredo

Replies: 32
Views: 2240

PostForum: Conserving, Preparing and Cleaning Minerals   Posted: Jul 29, 2019 18:38   Subject: Re: Uraninite storage
Bob, I think your insinuation that someone might want radioactive minerals for nefarious purposes ("Legitimate reasons or?") is a bit ridiculous and paranoid. What illegitimate activities co ...
  Topic: Uraninite storage
alfredo

Replies: 32
Views: 2240

PostForum: Conserving, Preparing and Cleaning Minerals   Posted: Jul 29, 2019 16:32   Subject: Re: Uraninite storage
Warnings about the danger of high doses of radiation are of course warranted and I would never disagree with that, although likely to be encountered only in cases of industrial accidents and not in a ...
  Topic: Uraninite storage
alfredo

Replies: 32
Views: 2240

PostForum: Conserving, Preparing and Cleaning Minerals   Posted: Jul 29, 2019 13:22   Subject: Re: Uraninite storage
I question how easy it is for radon to escape from massive uraninite, because the decay of uranium releases helium as well as radon and often the helium is still in there - It effervesces out when a u ...
  Topic: Certificates of authenticity for analyzed rare mineral specimens
alfredo

Replies: 7
Views: 773

PostForum: Minerals and Mineralogy   Posted: Jul 29, 2019 10:28   Subject: Re: Certificates of authenticity for assayed rare mineral specimens
In my youth I wanted to have at least one of every known mineral so, although I didn‘t know the term at the time, I was a "systematic species collector". After a few years it became evident ...
  Topic: Colours of Rhodochrosite and Other Mn Bearing Carbonates
alfredo

Replies: 9
Views: 1108

PostForum: Minerals and Mineralogy   Posted: Jul 24, 2019 11:59   Subject: Re: Colours of Rhodochrosite and Other Mn Bearing Carbonates
In 12 years working in Bolivian mines, I never once saw a pink rhodochrosite, only brown ones, but that of course is meaningless - There may well be many things I never saw.

The alleged pink rhodoc ...
  Topic: Need help with identification
alfredo

Replies: 10
Views: 871

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Jul 23, 2019 03:56   Subject: Re: Need help with identification
Right, I should have written goethite rather than hematite, or better yet "iron oxides", because color and streak give good guidance but are not really definitive. More than once I‘ve been p ...
  Topic: Colours of Rhodochrosite and Other Mn Bearing Carbonates
alfredo

Replies: 9
Views: 1108

PostForum: Minerals and Mineralogy   Posted: Jul 23, 2019 03:50   Subject: Re: Colours of Rhodochrosite and Other Mn Bearing Carbonates
Rhodochrosites in Bolivia tend to be brown and difficult to distinguish from siderite. I suppose this is due not just to the fact that Fe replaces some of the Mn, but also to the oxidation state of th ...
  Topic: Need help with identification
alfredo

Replies: 10
Views: 871

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Jul 22, 2019 06:28   Subject: Re: Need help with identification
I agree with Bob. Definitely not a meteorite, and probably mammilary hematite. The only other mineral that can look like that is the "wood tin" variety of cassiterite, but that‘s a lot more ...
  Topic: A potpourri of musings....barely related to minerals.
alfredo

Replies: 8
Views: 1563

PostForum: Off-Topic and Introductions   Posted: Jun 20, 2019 04:30   Subject: Re: A potpourri of musings....barely related to minerals.
The probability that any intelligent extraterrestrials, if they exist all, would look humanoid, like in Hollywood films, is close to zero. The fact that intelligent life even on Earth looks humanoid i ...
  Topic: A potpourri of musings....barely related to minerals.
alfredo

Replies: 8
Views: 1563

PostForum: Off-Topic and Introductions   Posted: Jun 13, 2019 01:41   Subject: Re: A potpourri of musings....barely related to minerals.
Bob, I had wondered before how the very thin Martian atmosphere was able to create dust storms... How is that extremely thin wind able to lift up and entrain particles of minerals? Yet apparently it d ...
  Topic: Fossil Leaf ?
alfredo

Replies: 9
Views: 1029

PostForum: What is it? - Where is it from?   Posted: May 07, 2019 20:35   Subject: Re: Fossil Leaf ?
I disagree that this is a "man-made fake". If I were trying to make a fake fossil leaf, I'd make one much more intact and beautiful than this! Who on earth would try to manufacture such an i ...
  Topic: Curious Little Rock...Help with ID?
alfredo

Replies: 7
Views: 988

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: May 06, 2019 20:23   Subject: Re: Curious Little Rock...Help with ID?
Barite?
 
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