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


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Newest topics and users posts
24 Jun-08:35:32 Re: gold? (Kevin Schofield)
24 Jun-06:28:25 Re: collection of firmo espinar (Firmo Espinar)
24 Jun-06:20:27 Re: gold? (Firmo Espinar)
23 Jun-22:54:25 Sainte-marie-aux-mines 2022 - first official day (Jordi Fabre)
23 Jun-21:05:36 Gold? (Duane01)
23 Jun-18:57:56 Re: collection of michael shaw (Michael Shaw)
23 Jun-15:10:26 Re: collection of michael shaw (Silvia)
23 Jun-12:22:16 Re: collection of volkmar stingl (Volkmar Stingl)
23 Jun-09:39:11 Re: collection of michael shaw (Michael Shaw)
22 Jun-17:40:56 The mizunaka collection - quartz (Am Mizunaka)
22 Jun-15:48:39 Romania - silvia's collection (Silvia)
22 Jun-13:14:20 Re: please help id, maybe pyrite? (Dirk Black)
22 Jun-13:12:02 Re: please help id, maybe pyrite? (Vic Rzonca)
22 Jun-13:10:48 Re: please help id, maybe pyrite? (Dirk Black)
22 Jun-13:09:16 Re: please help id, maybe pyrite? (Peter Megaw)
22 Jun-13:02:57 Please help id, maybe pyrite? (Dirk Black)
22 Jun-02:39:18 Re: sainte-marie-aux-mines 2022 - day one (Marticv)
22 Jun-02:36:16 Re: sainte-marie-aux-mines 2022 - the reunion (Marticv)
22 Jun-02:33:44 Re: sainte-marie-aux-mines 2022 - the reunion (Marticv)
21 Jun-15:09:34 Re: the mizunaka collection- ottens china ii book plus updated image (Am Mizunaka)
21 Jun-13:46:37 Re: collection of volkmar stingl (Volkmar Stingl)
21 Jun-06:08:06 Re: collection of volkmar stingl (Tobi)
21 Jun-04:56:35 Re: the mizunaka collection- ottens china ii book plus updated image (Tobi)
21 Jun-02:42:00 Re: sainte-marie-aux-mines 2022 - getting back together (Marticv)
21 Jun-00:14:17 Re: the mizunaka collection- ottens china ii book plus updated image (Am Mizunaka)

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  Topic: Possible high grade Osmiridium ore sample?
alfredo

Replies: 14
Views: 959

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Jun 08, 2022 03:21   Subject: Re: Possible high grade Osmiridium ore sample?
Sorry, Laurent, I completely missed that you'd already given the specific gravity in your first post.

As for the colors, in the photos the metallic parts look pinkish to me and the surface alterati ...
  Topic: Possible high grade Osmiridium ore sample?
alfredo

Replies: 14
Views: 959

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Jun 07, 2022 15:17   Subject: Re: Possible high grade Osmiridium ore sample?
Forget the XRF, which is obviously not properly calibrated for the type of material you have. Best first measure the density, which doesn't need any high-tech equipment other than accurate weight meas ...
  Topic: How long does it take for a crystal to form?
alfredo

Replies: 13
Views: 816

PostForum: Minerals and Mineralogy   Posted: May 30, 2022 12:23   Subject: Re: How long does it take for a crystal to form?
There is evidence that some large gem crystals in pegmatite pockets grew in just hours or days, and some crystalline gold plates in quartz fissures could have formed in only minutes or seconds. At the ...
  Topic: Need help identifying this rock
alfredo

Replies: 10
Views: 796

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: May 18, 2022 11:11   Subject: Re: Need help identifying this rock
Looks like some kind of artificial decorative aggregate, not a natural rock.
  Topic: What is it?
alfredo

Replies: 6
Views: 535

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: May 13, 2022 10:18   Subject: Re: What is it?
I agree with Firmo: Quartz with inclusions, from Brazil.
  Topic: Mineral Label Translation
alfredo

Replies: 8
Views: 913

PostForum: What is it? - Where is it from?   Posted: May 11, 2022 09:55   Subject: Re: Mineral Label Translation
I can only read a few of the words, but the locality appears to be Haslital, which is here: https://www.mindat.org/loc-26735.html
  Topic: What type of crystallisation is this?
alfredo

Replies: 1
Views: 338

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Apr 19, 2022 08:15   Subject: Re: what type of crystallisation is this?
Your first 3 pictures look like hemimorphite from the Ojuela mine, in Mexico, like this one, for example:

https://www.mindat.org/photo-244566.html
  Topic: wisdom quartz
alfredo

Replies: 6
Views: 897

PostForum: What is it? - Where is it from?   Posted: Apr 17, 2022 03:12   Subject: Re: wisdom quartz
Amir, Regarding the origin of the term "spirit quartz", the mystical sellers latched onto the name because it was more eminently marketable to their "spiritual" customers, but I on ...
  Topic: wisdom quartz
alfredo

Replies: 6
Views: 897

PostForum: What is it? - Where is it from?   Posted: Apr 16, 2022 07:28   Subject: Re: wisdom quartz
We can't answer the question, because "wisdom quartz" is not a mineralogical term with a scientific definition, it's just a marketing gimmick made up by some seller to sell more quartz cryst ...
  Topic: Jade, chalcedony or????
alfredo

Replies: 7
Views: 982

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Apr 09, 2022 07:29   Subject: Re: Jade, chalcedony or????
"In addition another phase of SiO2 is present = moganite (not beryl morganite)."

Roger, moganite is mainly present in younger chalcedonies as it is unstable. So chalcedonies from older g ...
  Topic: Jade, chalcedony or????
alfredo

Replies: 7
Views: 982

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Apr 07, 2022 03:03   Subject: Re: Jade, chalcedony or????
It would be interesting to know what the H7 test pick is made out of. If it leaves a silver mark then it must be made out of metal, and the only metals that reach that hardness are osmium and iridium. ...
  Topic: Jade, chalcedony or????
alfredo

Replies: 7
Views: 982

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Apr 06, 2022 05:07   Subject: Re: Jade, chalcedony or????
Thanks for the detailed description - If everyone gave this much info on stuff that needed an ID, our task would be much easier!

The information you give (the photos, the density, the analysis) poi ...
  Topic: Why would crystals be inside of pyrite
alfredo

Replies: 9
Views: 930

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Apr 05, 2022 03:19   Subject: Re: Why would crystals be inside of pyrite
The cross might perhaps be a "Japan-law twin", like these: https://www.mindat.org/photo-656770.html
  Topic: What is the correct name for this rock?
alfredo

Replies: 6
Views: 799

PostForum: What is it? - Where is it from?   Posted: Mar 29, 2022 01:23   Subject: Re: What is the correct name for this rock?
Looks like obsidian, and the locality fits too.
  Topic: Spherical inclusions in amethyst - cristobalite? vs fluorite
alfredo

Replies: 13
Views: 1371

PostForum: Minerals and Mineralogy   Posted: Mar 28, 2022 03:55   Subject: Re: Spherical inclusions in amethyst - cristobalite? vs fluorite
"But I wonder - do the spheroids penetrate into the amethyst or are they strictly on the surface of the amethyst?"

Usually they are completely enclosed inside the amethyst crystal. I had ...
  Topic: Formicaite. Beta-formicaite & alpha-Ca-formate. Mineral or not? - (39)
alfredo

Replies: 8
Views: 1323

PostForum: Featured Columns of FMF   Posted: Mar 19, 2022 14:58   Subject: Re: Formicaite. Beta-formicaite & alpha-Ca-formate. Mineral or not? – (39)
Cesar, I hope you stay healthy and don't get sick from touching material from that site!
  Topic: Mineralogist curricula
alfredo

Replies: 5
Views: 810

PostForum: Off-Topic and Introductions   Posted: Mar 19, 2022 13:39   Subject: Re: Mineralogist curricula
University of Miami, in Oxford, Ohio.
  Topic: Should I be concerned about this nugget?
alfredo

Replies: 14
Views: 1527

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Mar 19, 2022 13:01   Subject: Re: Should I be concerned about this nugget?
The fact that you found it with a metal detector tells us one property of the material: that it's an electrical conductor, which eliminates from consideration a lot of grey metallic minerals that are ...
  Topic: Formicaite. Beta-formicaite & alpha-Ca-formate. Mineral or not? - (39)
alfredo

Replies: 8
Views: 1323

PostForum: Featured Columns of FMF   Posted: Mar 19, 2022 12:49   Subject: Re: Formicaite. Beta-formicaite & alpha-Ca-formate. Mineral or not? – (39)
Very interesting article, and interesting crystals. Thank you!

One thing I'd like to point out is that solubility in water has absolutely no influence on whether a substance qualifies as a legitima ...
  Topic: Should I be concerned about this nugget?
alfredo

Replies: 14
Views: 1527

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Mar 19, 2022 12:14   Subject: Re: Should I be concerned about this nugget?
The nugget in your first photo is pure enough that a density test would go a long way in helping to identify it. Grey metallic minerals without crystal faces are impossible to identify just from looki ...
 
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