What are they? Beach glass or quartz pebbles

[Earth]

I have found only 5 or 6 of these within a few months on the Delaware Coast. Are they sea glass or quartz pebbles? The last pic is a broken one to see the inside.

 

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[Blak bart]

I have found only 5 or 6 of these within a few months on the Delaware Coast. Are they sea glass or quartz pebbles? The last pic is a broken one to see the inside.

I would say they are quartz pebbles they are very round and uniform. If they are quartz they look to be nice quality. Your other thread looks like amethyst. Just my opinion I may be wrong about that. Happy hunting.

 

[Eu_citzen]

Do a hardness test. Quartz will scratch glass.