Slag glass or Green obsidian

[Apocs]

Hi everyone,

New here, I stumbled across the forum whilst looking to identify some rocks I obtained whilst beach combing. As the subject line suggests, I have narrowed it down to slag glass or green obsidian, although I am no expert so I welcome any suggestions.

Hardness test - super hard, knife doesn't touch it
Acid test - no reaction to the naked eye
Magnetic - no

Any help is much appreciated, and I look forward to meeting some of the members here.

First set is a small example, about an inch. Second set is a more roughly formed example, both quite heavy for the size about 2 inches and 2.5 inches.

Thank you

 

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[I'm Hoping]

I do collect rocks and minerals, some fossils. I'm no expert but I believe you have slag glass. It's still nice.

 

[galenrog]

Not obsidian. Could be slag glass. Based only on the images, there are other possibilities, however. I would suggest taking it to a lapidary club, lapidary shop, or a gem and mineral club. Someone at one of these places should be able to ball you positively identify what you have.

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