Use fine sandpaper or a sharpening stone, whet stone, to remove the sharp edges being careful not to scratch the reflective backing. This will also strengthen the glass/mirror by reducing faults where breaks can occur.
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A crystal!!
Well, darling, an ellipsoid has one curved face and zero edges. It's like a smooth, sexy potato that's just all curves and no sharp edges. So, if you're looking for a shape with more edges, you might want to switch gears and go for something a little more angular.
erosion -help i helped a lot :)
Please stop by a bank and ask them for some other $1 coins. All "golden" dollars have smooth edges to make them more identifiable to people who are blind or have limited vision. The coins' smooth edges make it easier to tell them apart from quarters and half dollars when touched.
polyhedran