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Thank you very much for information! I probably don't trust this seller cause they claimed it was all sandstone. Plus I don't things like granite leaching into my aqaurium. I took a geology class in college but am a little rusty. I think I'll stick to rocks from pet stores which are safer. I...

Hello! I found these beautiful rocks on etsy. The seller claims they are sandstones but others have told on other forums that some are not in fact sandstone. Can I please get id's for these rocks. They are two different sets. Thank you! :) I would also like to know if this is in fact sandstone...