German scientists also say that they prepared clean monocrystals of the LK-99 - but the shards pictured are neither homogeneous, neither crystalline for me. They look merely like fragments of ruby glass. Worse then, they're not even black but merely transparent slightly coloured with copper(?) ions. I.e. the level of doping can not be too high there. And the copper appears to be in zero-valent state there - not oxidized one
IMO if LK-99 superconductor works then because long chain of copper (3+) ions embedded within apatite channels attract electrons from outside like hungry hens to a long feeder, which would then create a superconductive phase there. But such a mechanism requires rather high concentration of copper ions in highly oxidized state. The apatite sample presented may have its value in jewellery business, but definitely not in superconductor applications. And similar problem follow all attempts for replication presented so far. This is merely Cargo-cult science - not superconductor one.