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#11
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Blueish and smooth is probably sedimentary. Not an ideal choice. Neither is metamorphic, can contain metals. Best bet is rock forged from 'liquid hot magma' (Dr.Evil voice), which is Igneous.
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#12
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What are you planning on using these rocks for btw? Been there done that with beach rocks. Are you wanting more biological filtration? Or wanna use them as a substrate in your display?
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