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19 May-18:32:23 Re: need help identifying this rock (Bob Morgan)
19 May-14:30:20 Re: need help identifying this rock (John S. White)
19 May-14:00:26 Re: calcite in malkhan elbaite (Roger Warin)
19 May-12:55:48 Re: need help identifying this rock (Bob Morgan)
19 May-12:23:13 Re: calcite in malkhan elbaite (Josele)
19 May-09:59:30 Re: calcite in malkhan elbaite (Jesse Fisher)
19 May-09:12:52 Re: the mim museum in beirut, lebanon (Bob Kerr)
19 May-08:23:52 Re: collection of michael shaw (Michael Shaw)
19 May-07:57:45 Re: the mim museum in beirut, lebanon (Mim Museum)
19 May-04:13:10 Re: calcite in malkhan elbaite (Jordi Fabre)
19 May-03:57:35 Re: calcite in malkhan elbaite (Edelmin)
19 May-02:07:01 Re: calcite in malkhan elbaite (Gagat Minerals)
19 May-00:26:00 Re: calcite in malkhan elbaite (Roger Warin)
18 May-17:29:56 Re: need help identifying this rock (Matt_zukowski)
18 May-16:22:38 Re: need help identifying this rock (Rukittnritemeow)
18 May-14:48:38 Re: need help identifying this rock (Pete Richards)
18 May-14:46:21 Re: calcite in malkhan elbaite (Jesse Fisher)
18 May-14:26:20 Re: need help identifying this rock (John S. White)
18 May-13:56:37 Calcite in malkhan elbaite (Roger Warin)
18 May-11:11:33 Re: need help identifying this rock (Alfredo)
18 May-11:00:23 Need help identifying this rock (Rukittnritemeow)
18 May-02:15:24 Re: the mim museum in beirut, lebanon (Tobi)
17 May-22:38:32 Re: collection of volkmar stingl (Volkmar Stingl)
17 May-03:14:23 Re: the mim museum in beirut, lebanon (Mim Museum)
16 May-08:20:07 Re: help with mineral identification in thin section from khibiny, kola peninsula (Daniel Garcia)

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  Topic: Need help identifying this rock
alfredo

Replies: 8
Views: 281

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: 370

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: 669

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: 261

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: 755

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: 755

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: 814

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: 814

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: 814

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: 774

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: 646

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: 1101

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: 994

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: 651

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: 1302

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: 994

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: 1302

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 ...
  Topic: Cabeça do Cachorro claim
alfredo

Replies: 11
Views: 1497

PostForum: Improving the FMF Data Base of localities   Posted: Mar 16, 2022 18:51   Subject: Re: Cabeça do Cachorro claim
This 40 cm (16 inches) piece was my favorite among the 90 Kg lot I saw. Vivianite from a cavity in pisolitic limonite.
  Topic: Corundum with green?? xls
alfredo

Replies: 18
Views: 2201

PostForum: What is it? - Where is it from?   Posted: Feb 21, 2022 14:57   Subject: Re: Corrundum with green?? xls
Could be that someone picked it up at one of the tourist gem mines in North Carolina, but the operators there often "salt" the mines with scraps of gem rough from all over the world so, as R ...
  Topic: Help identify strange rock sample
alfredo

Replies: 6
Views: 1049

PostForum: FOR BEGINNERS: What is it? Where is it from?   Posted: Feb 20, 2022 17:43   Subject: Re: help identify strange rock sample
Artificial glass. Beautiful, but not a mineral.
 
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