Solid neutron star matter above the neutron-drip threshold has thermal fluc
tuations in nuclear charge, near the melting temperature, so large that the
system probably cools to amorphous heterogeneous form rather than the homo
geneous bce lattice usually assumed. This result, obtained by the calculati
on of impurity nucleus formation enthalpy, shows the need to reconsider the
electrical conductivity of neutron star matter, the evolution of the magne
tic flux distribution, and the role of superfluid neutron vortex pinning in
pulsar glitch phenomena.