Miller Indices

What are Crystal Coordinates?

• Crystal coordinates are a system for describing atomic positions in a crystal lattice using a unit cell.
• Crystal coordinates describe the chemical composition of a crystal.
• Crystal coordinates are used to measure temperature in crystals.
• Crystal coordinates refer to the color of crystals in a gemstone.

What are Miller Indices?

• Notation for describing directions, families of directions, planes, and families of planes in a crystal structure

• Notation for describing directions in a crystal structure

• Notation for describing planes in a crystal structure

• Notation for describing the origin of a unit cell

Miller Indices for crystal directions are denoted by (a)   brackets.

Families of directions are denoted by (a)   brackets.

What is the most reduced form of this direction? [224]

• [124]

• [222]

• 112

• [112]

Draw the direction [101]

Draw the direction [111]

Draw the direction [110]

Draw the direction [100]

How many different directions are possible in a cubic family of directions?

• 6

• 8

• 10

• 12