Question about unit cells in minerals?

What is the practical purpose of vectors within crystal unit cells? What information do they provide and how is the formula writtien for them? Do vectors alo relate to moving from one unit cell to another? I am new to this stuff so basic responses would be appreciated.

Answer:
Vectors within unit cells are useful because they denote a certain direction within a unit cell. Properties of a given material can be different when measured in different directions (this phenomenon is known as anisotropy).

A unit cell has axes labeled a, b, and c. A vector is usually written in the form [ a b c ] in whole numbers indicating how many units to move along each axis.

Vectors are not used so much to describe moving from one unit cell to another though. If you have a single crystal material, all the unit cells are aligned and the property will be the same in a given direction through the whole crystal.

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