Crystallography: statements about unit cells Evaluate standard statements about unit cells (crystal lattices) and choose the most comprehensive correct option. Which is correct?

Concept
A unit cell is the smallest repeating building block of a crystal lattice. All unit cells in a given single crystal share the same orientation and parallelism of corresponding faces; repeating the unit cell along lattice vectors reconstructs the entire lattice.

Why all true

• (a) Captures the representative nature of the unit cell.
• (b) Unit cells in a single crystal are identically oriented; similar faces are parallel.
• (c) The formal definition: a smallest parallelepiped (the unit cell) that, by translation along three non-coplanar vectors, fills space.

Final Answer
All of the above