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Answer: quasicrystals
Answer	Crossword Clue
quasicrystals	QUASICRYSTAL, a body of solid material that resembles a crystal in being composed of repeating structural units but that incorporates two or more unit cells into a quasiperiodic structure
quasicrystals	A locally regular aggregation of molecules resembling a crystal in certain properties (such as that of diffraction) but not having a consistent spatial periodicity

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.

Answer: quasicrystals