Even lead apatite is anisotropic. It conducts electrons along a plane from lead atom to lead atom --- where the phosporous atoms are insulators. Superconducti

Even lead apatite is anisotropic. It conducts electrons along a plane from lead atom to lead atom --- where the phosporous atoms are insulators. Superconductivity in LK-99 moves along a similarly anisotropic two-dimensional plane.