• Register

Information for users from the old Q&A site
If you have an account from our old Q&A site, your account was transferred over, but you need to reset your password and confirm your email address.
Reset Password here
Confirm Email here

2,235 questions

3,905 answers


109,820 users

Anyone know what this rock is?

0 votes

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 textalt textalt text alt text alt textalt text

asked Apr 4, 2013 by Penguin453 (200 points)

3 Answers

0 votes

Looks like slag from mining operations. Especially from the 3rd picture. Is it very heavy or attracted to magnets?

answered Apr 5, 2013 by hershel (52,800 points)

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.

0 votes

Are there any old quarries or mines in the area?

answered Apr 9, 2013 by hershel (52,800 points)

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.

thanks hershel

0 votes

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.

answered Apr 10, 2013 by hershel (52,800 points)

Related questions

0 votes
2 answers
asked Nov 6, 2015 by Dizzard (830 points)
0 votes
2 answers
asked Jun 22, 2013 by heavenjll (120 points)
0 votes
3 answers