# Crystal Shapes and Unit Cells

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### Cubic

all sides the same and all right angles.

### Tetragonal

square on two ends and the other sides have rectangles. Tetra means four, and four of the faces are the same. All right angles.

### Orthorhombic

Ortho means right angles. Orthodontists put teeth at right angles. All rectangles. No squares.

### Triclinic

All three pairs of faces are parallelograms.

### Hexagonal

One pair of faces are hexagonal, the others are rectangles.

### Rhombohedral

Rhombus is a diamond. All the sides are the same. The angles are not square.

### Monoclinic

Angles are not square. Parallelogram on pair of faces, other sides rectangles. One pair of parallelograms. In picture back and front are parallelograms.

### Cubic Unit Cell

8 atoms arranged in nice unit cells.

### Face-Centered unit cell

A cubic unit cell with an atom in the middle of each face. Picture dice with a one on each side.

### Body Centered Unit Cell

One atom in the center of the cube.

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