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These were about the same hardness as what I'm used to with my found rocks.
My "feather" rock came apart cleanly on a seam. Made a quick check on a site that I found on GeekPress. Nothing was said about gluing stone to stone, but it said super-glue was good for ceramic to ceramic.
I glued the two pieces together and continued on.
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220grit grind -
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600grit sanding -
220 and 360grit sandings had a few scratches develop but were removed in later sandings.
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1200grit Polish --
