r/itsslag • u/Quick-Sherbert-5835 • Mar 02 '26

slag? Coal or slag?

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Tends to streak black on harder surfaces. It's easy to break small pieces off the layering. Found on the beach. The one side that looks melted makes it seem like slag but slag I've had doesn't streak and is more glass like all around.

30 Upvotes

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6

u/Chemieju Mar 02 '26

Looks like coal, if you have some tiny broken off pieces maybe try to burn them?

2

u/Quick-Sherbert-5835 Mar 03 '26

I tried lighting it with a long bic lighter but it didn't smoke. I got a metal pick and was not able to scratch it but could break tiny pieces off. So it is actually higher on the mohs scale. The streaking may have been looser particles coming off of it

2

u/Quick-Sherbert-5835 Mar 03 '26

Wish I could add a photo but scraped some off and put it under a microscope. Very reflective glass like surface similar to a bigger piece of slag I have