Assertion: calcite's crystal | /r/Synonym | crystallite
Facets:
Source sentences:
text: Microscopically, a single crystal has atoms in a near-perfect periodic arrangement; a polycrystal is composed of many microscopic crystals (called " crystallites " or "grains"); and an amorphous solid (such as glass ) has no periodic arrangement even microscopically.
text: In the final block of ice, each of the small crystals (called "crystallites" or "grains") is a true crystal with a periodic arrangement of atoms, but the whole polycrystal does not have a periodic arrangement of atoms, because the periodic pattern is broken at the grain boundaries.