Quote Originally Posted by Clayglen View Post
What do you think it might be? The seller called it a blue-green thuringan but didn't make promises.
It's quite hard and butter smooth.

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They are usually uniform in shape like a quarried stone and I haven't seen one with white lines or inclusions through it like that before. The slurry looks right colour but what did you use to create it? Not sure what it is but might be worth starting a new thread and asking the rock hounds.