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Hi @marram. Do you have fiberglass?
I am guessing concrete would work because it shrinks as it dries and will put pressure on the crystal. It won't look pretty. That is only my guess. Can you google orgonite? Lots of ideas out there.
Good luck and thanks for commenting.

i had only curiosity if could be made with other material and i trust more in people that know (like you) than random pages of internet.
Actually i can buy more easy fiberglass than resin, Thanks for this help.

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