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What is this blue rock?

I have no clue of its origins; I believe somewhere in the USA.

It did not scratch with the knife test. It is about 1 1/2” x 1”.
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  • 1
    Please read this guide and add as much information as you can. – Spencer Nov 8 at 23:45
  • This is probably artificial glass. – Gimelist Nov 9 at 8:12

I am pretty sure you have some bulk glass. It is readily available at a number of locations that also sell rocks and also places that sell landscaping materials.

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