I was somewhat disappointed in the Malachite when I turned it. It seemed to be on a par with some of the acrylics in its looks. Like you, Bob, I had a heck of a time getting it polished to my satisfaction - even with EEE Ultra Shine, new micro-mesh and 20/20 Polish.
The lapis (IMHO) has a more realistic look but since I'm momentarily out of the higher end kits to pair it with, the now turned tubes are sitting on the bench waiting for a kit.