[Submitted on 1 Aug 2023]
Abstract: A recent paper [Lee {em et al.}, J. Korean Cryt. Growth Cryst. Techn. {bf
33}, 61 (2023)] provides some experimental indications that
Pb$_{10-x}$Cu$_x$(PO$_4$)$_6$O with $xapprox 1$, coined LK-99, might be a
room-temperature s
