Sadly no Ron - except that their relative densities vary slightly. Given they are all sized the same, this could affect cartridge weight. I did some digging into scientific papers but could not find anything useful with respect to damping characteristics or resonance.
I have no basis ability to do a comparison as my cartridges all have bodies of different types: Rosewood ALNiCo, Vermillion, Jade (a pyroxene), and Tiger eye (quartz/crocidiolite).
If someone had an onyx and blue lace that would be an interesting comparison!
