Final answer:
A hexagon shape in X-ray crystallography indicates a well-ordered crystal lattice, as the shape reflects the symmetry of the crystalline structure.
Step-by-step explanation:
A hexagon shape present in X-ray crystallography typically indicates c) A well-ordered crystal lattice. In X-ray crystallography, diffraction patterns are produced by the scattering of X-rays from crystals. The pattern observed, which can include various shapes such as hexagons, reflects the symmetry of the crystalline structure of the sample.
A well-defined and regular pattern, such as a hexagon, suggests that the atoms, ions, or molecules in the crystal are arranged in a regular and repeating pattern, indicative of a well-ordered lattice. On the other hand, crystal defects such as vacancies, interstitial atoms, and substitution impurities can disrupt the regular arrangement, but these usually do not produce well-defined geometric shapes like hexagons in the diffraction pattern.