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Unknown metallic material
  
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Robson Vieira




Joined: 05 Jan 2017
Posts: 28
Location: São Paulo

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PostPosted: Jul 17, 2020 17:56    Post 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: metallic
Hardness: 5,5 to 6,0
Streak: greyish
Magnetism: none
Cleavage: none
Fracture: no regular
Other: no acid reaction, no crystal shape, no taste at all, iridescence a little bit, the real location the stuff was found is not known...
I would be grateful for your help.
Thanks a lot



IMG-20200717-WA0012.jpg
 Mineral: Unknown
 Locality:
São Paulo State, Brazil
 Dimensions: 12 cm x 4 cm
 Description:
North São Paulo State
 Viewed:  760 Time(s)

IMG-20200717-WA0012.jpg



IMG-20200717-WA0017.jpg
 Mineral: Unknown
 Locality:
São Paulo State, Brazil
 Dimensions: 12 cm x 4 cm
 Description:
North São Paulo State
 Viewed:  762 Time(s)

IMG-20200717-WA0017.jpg



IMG-20200717-WA0011.jpg
 Mineral: Unknown
 Locality:
São Paulo State, Brazil
 Dimensions: 12 cm x 4 cm
 Description:
North São Paulo State
 Viewed:  763 Time(s)

IMG-20200717-WA0011.jpg



IMG-20200717-WA0016.jpg
 Mineral: Unknown
 Locality:
São Paulo State, Brazil
 Dimensions: 12 cm x 4 cm
 Description:
North São Paulo State Streak
 Viewed:  762 Time(s)

IMG-20200717-WA0016.jpg


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Robson Vieira




Joined: 05 Jan 2017
Posts: 28
Location: São Paulo

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PostPosted: Jul 20, 2020 19:01    Post 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?
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Bob Morgan




Joined: 18 Jan 2018
Posts: 88
Location: Savannah, Georgia


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PostPosted: Jul 20, 2020 19:14    Post subject: Re: Unknown metallic material  

I'm perhaps showing ignorance, but your specimen reminds me of a chunk of silicon someone gave me years ago. It had been refined some, probably for the computer chip industry. I don't know what properties it had compared to your tests. 'Just a thought.
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Robson Vieira




Joined: 05 Jan 2017
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Location: São Paulo

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PostPosted: Jul 20, 2020 20:20    Post 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 high density alloy, I just don't know.
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