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 Post subject: Small rock and question from Costa Rica
PostPosted: Thu Apr 20, 2017 2:35 pm 
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Greetings to all from Costa Rica
A few years ago I collected this small rock of a beach and since then I wanted to identify what it is, it seems to be some kind of glass or metal. It draws attention to the stripes or striae it has.
Any idea what could be treated ??


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 Post subject: Re: Small rock and question from Costa Rica
PostPosted: Thu Apr 20, 2017 9:32 pm 
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Joined: Sun Oct 16, 2005 12:22 pm
Posts: 17841
Location: San Francisco
I moved your post.
It is NOT a forum announcement.


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