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10 Aug-12:08:59 Re: calcite ? (Dany Mabillard)
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10 Aug-01:45:42 Re: about cyclic twinning - (5) (James Catmur)
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09 Aug-22:29:05 Re: about cyclic twinning - (5) (Kevin Conroy)
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09 Aug-14:38:08 Re: collection of sante celiberti - a mineralogical trip through italy (Sante Celiberti)
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09 Aug-11:10:11 Re: help needed for chinese locations (Dany Mabillard)
09 Aug-09:47:12 Re: help needed for chinese locations (Volkmar Stingl)
09 Aug-09:33:00 Calcite ? (Dany Mabillard)
09 Aug-07:45:29 Re: help needed for chinese locations (Dany Mabillard)
08 Aug-23:25:53 Re: don lum collection (Don Lum)

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  Topic: Unknown metallic material
Robson Vieira

Replies: 3
Views: 573

PostForum: What is it? - Where is it from?   Posted: Jul 20, 2020 20:20   Subject: Re: Unknown metallic material
Hi Bob interesting fact you stated. I had not thought of this possibility. It has clarified the question, even though my sample seems too dense to be silicon. I have minded if it could be an industry ...
  Topic: Unknown metallic material
Robson Vieira

Replies: 3
Views: 573

PostForum: What is it? - Where is it from?   Posted: Jul 20, 2020 19:01   Subject: Re: Unknown metallic material
Honestly, i would expect a more greenish streak and, mainly, too heavy for pyrite? Also, my sample is too pale to match to the pyrite. Could it be from the pyrite family?
  Topic: Unknown metallic material
Robson Vieira

Replies: 3
Views: 573

PostForum: What is it? - Where is it from?   Posted: Jul 17, 2020 17:56   Subject: Unknown metallic material
Hello there.
Today i have a challenging material. The stuff is metallic like material, very dense and first of all, it looks like the pyrite family.
The main features are:
Density: 4,7
Luster: me ...
  Topic: I think it is manmade but....
Robson Vieira

Replies: 6
Views: 888

PostForum: What is it? - Where is it from?   Posted: Jun 21, 2020 20:42   Subject: Re: I think it is manmade but....
Hi Pete. I learned a lot with your explanation. Exactly what I had needed. Thank you.
  Topic: I think it is manmade but....
Robson Vieira

Replies: 6
Views: 888

PostForum: What is it? - Where is it from?   Posted: Jun 21, 2020 17:07   Subject: Re: I think it is manmade but....
Hi Peter and thank you for your comment. I would like to know how to differentiate slag from natural glass or another natural material. Could you help me? Is there a kind of rule to see?
  Topic: I think it is manmade but....
Robson Vieira

Replies: 6
Views: 888

PostForum: What is it? - Where is it from?   Posted: Jun 21, 2020 16:27   Subject: I think it is manmade but....
Hi folks. I was walking around in a small park near home and I found two lustrous stuff like a tree root. Obviously, I have investigated the material and I picked it up.
The images below show the mat ...
  Topic: Is this "dehydrated" opal?
Robson Vieira

Replies: 4
Views: 3786

PostForum: What is it? - Where is it from?   Posted: Jan 11, 2020 07:24   Subject: Re: Is this "dehydrated" opal?
Amazing!! Many thanks friends Amir and Ricardo. Regards from Brazil.
  Topic: Is this "dehydrated" opal?
Robson Vieira

Replies: 4
Views: 3786

PostForum: What is it? - Where is it from?   Posted: Jan 07, 2020 17:43   Subject: Is this "dehydrated" opal?
Hi folks. I have a chalcedony sample and I would like to clarify the identifcation. Here in Brazil it is common to refer this material as dehydrated opal. I refer to the white dull portion of the samp ...
  Topic: Black thin layer help id
Robson Vieira

Replies: 5
Views: 6218

PostForum: What is it? - Where is it from?   Posted: Dec 23, 2019 19:13   Subject: Re: Black thin layer help id
A genius idea David Mustart, thanks. Exactly as you had stated. The sample is brown at the opposite side. Would you say it solved the question? How can I detect the Mn presence to elucidate the ID?
...
  Topic: Would be an Enstatite?
Robson Vieira

Replies: 4
Views: 1903

PostForum: What is it? - Where is it from?   Posted: Dec 23, 2019 18:56   Subject: Re: Would be an Enstatite?
Yeah Steve, it makes sense. A hardness scribe would be helpful, because these kinds of pieces are hard to test, and the scribes have the essential: accuracy.
I tend to avoid home materials, like knif ...
  Topic: Would be an Enstatite?
Robson Vieira

Replies: 4
Views: 1903

PostForum: What is it? - Where is it from?   Posted: Dec 23, 2019 18:46   Subject: Re: Would be an Enstatite?
Thanks Bob, your idea is really helpful. I'm in doubt about the mineral exactly for the hardness data, because the other information about the sample could conduct to a final conclusion. I'm going to ...
  Topic: Would be an Enstatite?
Robson Vieira

Replies: 4
Views: 1903

PostForum: What is it? - Where is it from?   Posted: Dec 23, 2019 13:38   Subject: Would be an Enstatite?
Hello there. Now I bring an ugly chunk of rock from a gabbro quarry. The piece has an interesting kind of a crystal.
Color: greenish/yellowish gray. The luster can show golden metallic iridescent pa ...
  Topic: Black thin layer help id
Robson Vieira

Replies: 5
Views: 6218

PostForum: What is it? - Where is it from?   Posted: Dec 23, 2019 12:15   Subject: Re: Black thin layer help id
Thanks vic. Its very cool fact. But how about the low hardness? I guess the material of the slickenside should be the same of the rock, wich is basalt in this case, that has high hardness. Maybe, the ...
  Topic: Black thin layer help id
Robson Vieira

Replies: 5
Views: 6218

PostForum: What is it? - Where is it from?   Posted: Dec 23, 2019 10:33   Subject: Black thin layer help id
Hi everyone. I have found a little piece of basalt and it has a thin layer of a shiny black which I would like to know what it is. Follow the features of the LAYER only
Color: dark brown to black
L ...
  Topic: Zeolite identification
Robson Vieira

Replies: 2
Views: 9934

PostForum: Micros & Macros - Images of Minerals   Posted: Aug 12, 2018 17:59   Subject: Zeolite identification
Are there some tips to help differentiate scolecite from natrolite and thomsonite? How can I identify acicular and radial zeolite specimens without technical tools such as XRD? The question is more in ...
 
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