I found this rock on the coast of south Wales(I think) near Pembrokeshire but I don't know what it is. I don't really want to smash it because then it would lose its natural shape. I've had a go at the meteor identification websites, but my rock does not pass any tests.
Pictures below.alt text
Looks like slag from mining operations. Especially from the 3rd picture. Is it very heavy or attracted to magnets?
It weighs 437g, which for a rock of that size, is quite heavy? Correct me I may be wrong. It's not attracted to magnets as I've tried with many fridge magnets and horseshoe magnets.
Are there any old quarries or mines in the area?
Wales was famous for mining coal but the last mine (In wales, not neccesarily pembroke) was closed down in 2008 a year(roughly) before I went. Although pembrokeshire was packed with mines they were all shut down. Pembroke also mined silver lead.
So that increases the likelihood of it being slag, which is a mining by-product. Although it may also be some sort of bubbly igenous rock, there is definitely a stronger inclination toward slag.