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American quartz without label
  
  Index -> What is it? - Where is it from?
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Roger Warin




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PostPosted: Jul 07, 2023 21:14    Post subject: American quartz without label  
This quartz specimen has me wondering:
What is its origin ?
Bought in the USA in the late 1970s-early 1980s.
The internal texture highlights the edges of the crystal.
How to explain it?

Quartz_USA_R.jpg
 Description:
Quartz
Locality: unknown from USA
unusual texture of inner edges
 Viewed:  12193 Time(s)

Quartz_USA_R.jpg
Quartz_USA-detail_R.jpg
 Description:
Quartz
Locality: unknown from USA
unusual texture of inner edges
 Viewed:  12199 Time(s)

Quartz_USA-detail_R.jpg
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alfredo
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PostPosted: Jul 08, 2023 02:20    Post subject: Re: American quartz without label  
What is the dark material between the quartz crystals?
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Roger Warin




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PostPosted: Jul 08, 2023 10:28    Post subject: Re: American quartz without label  
Thank you very much Alfredo,
Here is what I see for the late black deposit, without moving the specimen.
I see nodules of iron or Mn (oxides).
What do you think about dot?

Quartz_US_détails-ABC_R.jpg
 Mineral: Quartz
 Description:
 Viewed:  12081 Time(s)

Quartz_US_détails-ABC_R.jpg
Quartz_US_détails-#2-a_R.jpg
 Mineral: Quartz
 Description:
 Viewed:  12086 Time(s)

Quartz_US_détails-#2-a_R.jpg
Quartz_US-detail-a_R.jpg
 Mineral: Quartz
 Description:
 Viewed:  12082 Time(s)

Quartz_US-detail-a_R.jpg
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Peter Megaw
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PostPosted: Jul 08, 2023 12:58    Post subject: Re: American quartz without label  
A very long time ago I collected quartz very much like this from an outcrop across from the Pride of the West Mine in the Silverton Colorado area. The black stuff was not easy to get off.
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Roger Warin




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PostPosted: Jul 08, 2023 14:04    Post subject: Re: American quartz without label  
Many thanks Peter
I'm going to request an analysis of this dark matter.
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