coincidence boundary

coincidence boundary

[kō′in·sə·dəns ‚bau̇n·drē]
(crystallography)
A grain boundary separating crystal lattices which are rotated with respect to each other by an angle with a special value, resulting in a periodic grain boundary structure and an extension of a sublattice of the original lattice across the boundary.
References in classic literature ?
It is always some combination of effects which produces this result, and never a concrete form.
As I turned, romance, adventure, and discovery in the abstract took wing before the terrible embodiment of all three in concrete form that I beheld advancing upon me.
His abnormal power of vision made abstractions take on concrete form.
This unhappiness had almost a concrete form - something resembling a horrid bat.