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Bright Yellow, Porous "crust" Surrounding A Black Rock Mixture


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Hey everyone. I picked up this "rock" at the beach at Tramore, Ireland, a few years ago and recently found it in one of my drawers, wondering what it is.

It seems to consist of two parts:
Crust - bright yellow, porous, semi-hard on touch with minuscule shiny "glass" pieces
Inside - a mixture of different "rocks" covered by the crust

It's not magnetic, doesn't seem to fall apart, and is impossible to dent with fingers. I guess I could easily crack it with pliers and some pressure.

Thanks in advance for all tips!

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photo_2023-06-09_22-02-58.jpg

photo_2023-06-09_22-02-59.jpg

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We had one of these last year. It's road stripe paint with reflective glass beads in it. ?

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28 minutes ago, jasong said:

We had one of these last year. It's road stripe paint with reflective glass beads in it. ?

Like in the original post, I just tried sticking a burning hot needle into it. It's 100% road paint as the needle melted a hole in it ?‍♂️

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That is a bit of a letdown.It reminds me of my ex wives  attempt at making chocolate chip cookies.

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