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Search found 15 matches |
Author | Message |
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Topic: Unknown metallic material | |
Robson Vieira Replies: 3 Views: 3678 |
Forum: 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: 3678 |
Forum: 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: 3678 |
Forum: 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 ... |
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Topic: I think it is manmade but.... | |
Robson Vieira Replies: 6 Views: 6048 |
Forum: 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: 6048 |
Forum: 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: 6048 |
Forum: 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 ... |
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Topic: Is this "dehydrated" opal? | |
Robson Vieira Replies: 4 Views: 6704 |
Forum: 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: 6704 |
Forum: 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: 9245 |
Forum: 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?
... |
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Topic: Would be an Enstatite? | |
Robson Vieira Replies: 4 Views: 4804 |
Forum: 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 ... |
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Topic: Would be an Enstatite? | |
Robson Vieira Replies: 4 Views: 4804 |
Forum: 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: 4804 |
Forum: 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 ... |
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Topic: Black thin layer help id | |
Robson Vieira Replies: 5 Views: 9245 |
Forum: 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: 9245 |
Forum: 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 ... |
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Topic: Zeolite identification | |
Robson Vieira Replies: 2 Views: 14144 |
Forum: 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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