A crystal lattice may be considered as an aggregate of a set of parallel equi-distant planes of high density of lattices points, Hence lattice planes are also called Cleavage Points.

**Lattice Planes**

A crystal lattice may be considered as an
aggregate of a set of parallel equi-distant planes of high density of lattices
points, Hence lattice planes are also called Cleavage Points.

Or a given lattice, the lattice planes can be
chosen in a different number of ways, for example (a), (b), (c), and (d) as
shown in the figure 1.1.4

The problem is that how to designate a plane
in the crystal. Miller evolved a method to designate a plane in a crystal by
three numbers (h,k,l) known as Miller indices.

**Fundamental Crystallographic terms**

**Lattice** is defined as an array of points which
are imaginarily kept to represent the position of atoms in the crystal that
every lattice point has got the same environment as that o the other and hence
one lattice point cannot be distinguished from the other lattice point.

**Space Lattice or Crystal Lattice** is a three
dimensional collection of points in space. The environment about any particular
point is in everyway the same.

The regular pattern of points which describe
the three dimensional arrangement of particles in a crystal structure is called
the Crystal Lattice or Space lattice.

Basis is formed by associating with every
lattice point a uint of assembly of atoms or molecules identical in
composition. This unit assembly is called **Basis**.

The **Crystal Structure** is
formed by the addition of a basis to every lattice point.

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