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Help with these rocks??

1K views 2 replies 2 participants last post by  aaronjunited 
#1 ·
I have some pictures here, i collected this lot from the beach. No idea wat so ever what any of them are, hopefully someone can help.

rock 1


rock 2


rock 3


rock 4


rock 5


rock 6


rock 7


rock 8


different view of rock 8


rock 9 - looks like slate??


rock 10



Please can someone identify if these may be safe in an aquarium, and what they are.
Thanks.
 
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#2 ·
A way to tell is to pour vinegar on the rocks and if it foams it will change your water chemistry
 
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