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Glass or Obsidan....in Pink
  
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norman edwardwar




Joined: 22 Oct 2019
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PostPosted: Oct 23, 2019 02:47    Post subject: Glass or Obsidan....in Pink  

Hi all
I am a newbie here as well as collecting minerals. Over the years I have seen some amazing crystal clusters etc. but could not afford them. Recently a friend who was an avid collector gave me some of his collection.
Amongst the lot was this piece which a dealer at a fair said was Obsidian. But is it, or is it just glass. I would really like to hear the expert opinions.
Thanks



P1130544.JPG
 Mineral: Obsidian?
 Locality:
Arvigo, Calanca Valley, Mesolcina Valley, Grischun (Grisons; Graubünden), Switzerland
 Dimensions: 17 x 8cm high
 Description:
 Viewed:  644 Time(s)

P1130544.JPG



P1130542.JPG
 Description:
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P1130542.JPG


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Tobi




Joined: 07 Apr 2009
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PostPosted: Oct 23, 2019 03:11    Post subject: Re: Glass or Obsidan....in Pink  

Hi Norman,

quite sure this is man-made glass slag.

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Tobi
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SteveB




Joined: 12 Oct 2015
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PostPosted: Oct 23, 2019 04:47    Post subject: Re: Glass or Obsidan....in Pink  

Fairly certain this is glass. "pink obsidian" appears to be a marketing name applied to many genuinely and dyed pink specimens of mostly manmade substances. Nothing about what I see says "natural" to me but it screams "glass".
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James Catmur
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PostPosted: Oct 23, 2019 06:26    Post subject: Re: Glass or Obsidan....in Pink  

I vote for glass
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Pete Richards
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PostPosted: Oct 23, 2019 09:11    Post subject: Re: Glass or Obsidan....in Pink  

In addition to the comments already posted, obsidian is a product of volcanic eruptions. Are there any volcanos in Graubünden? I don't think so.
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Collecting and studying crystals with interesting habits, twinning, and epitaxy
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norman edwardwar




Joined: 22 Oct 2019
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PostPosted: Oct 23, 2019 09:22    Post subject: Re: Glass or Obsidan....in Pink  

Thank you all for looking.
As to Valcanos in Graubunden....the answer is No....but we do travel extensively 3 times a year and this friend , retired for 10 years, did just that and brought back some crazy stuff.

We do have a large community spread across the land who go mountain climbing, lots of them...mountains, and they have pulled out some whoppers.
Have a super weekend
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