(hahahaha 'to floss a megalodon') As pretty as Brazilian amethyst vugs are, they are still full of crystals. Cleaning this thing would be like trying to floss a Megalodon. Whoever came up with the idea is an evil genius.
Use a blow torch to create a duo-tone effect on wood. Lay the torch at such an angle that the flame licks across the surface as you move horizontally. After that, wipe it down with a wet cloth and sta(Stain Table Top)