Is this a stone? It scratches tempered glass

[Primalgold]

 

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[Oldrvrrat57]

Looks like a chunk of cobalt blue glass to me. I'm not aware of any blue obsidian.

 

[Primalgold]

Looks like a chunk of cobalt blue glass to me. I'm not aware of any blue obsidian.

It's likely a stone of some sort. It appears harder than glass

 

[ConceptualizedNetherlandr]

This is the rare and formerly unknown to exist on earth dilithium crystalline

Naquadah​

... many space explorers would pay premiums to acquire this. contact your nearest Ferengi trader to cash in now before the market drops!

 

[ConceptualizedNetherlandr]

Or it could be dangerous

 

[ArfieBoy]

It sure is a beautiful blue!

 

[unclemac]

unlikely

 

[AU Seeker]

View attachment 2196312

Just a bit of advice concerning what you wrote in your title...

I would highly advise not trying to scratch "tempered glass", tempered glass can and many times will shatter simply by just "scratching" it.

If you must scratch glass to do a hardness test make sure it regular glass and not tempered!