3/8" and 1/2" Clear.
Shower Door glass is always tempered. Non tmpered is called annealed. Tempering involves running the glass over rollers through an oven at 1200° for a couple of minutes, depending on thickness, and then it is quenched in warm air for about the same amount of time.

RIGIDITY: At right are two company pictures. Right picture we are standing on 3/8" glass, and the left is 1/2" glass. Notice the increased rigidity of 1/2" glass. When we install glass to glass doors with no header we recommend 1/2" glass for teh fixed panel to reduce wobble. But you can see from the pictures than wobble in itself is not dangerous.

3/8" and 1/2" STARPHIRE - (LOW IRON)
It is the iron in glass that makes it greenish. Starphire is also called Low Iron Glass.

IMPORTANT NOTICE ABOUT STARPHIRE: It has changed some in the last few years. For a while it had a nice turqoise glow on the edges. But it was very expensive. Without warning a couple of years ago, the turqoise glow was gone and the prices came down. Now more affordable, but it's not as nice as it was. It's still very clear and doesn't change the color of items viewed through the glass. It's very hard to take a picture that shows the difference. See Satin Glass below, which seems to amplify the difference.

3/8" and 1/2" SATIN GLASS and Starphire SATIN

Satin Glass is Acid etched. It looks like sandblasted but it seems more resistant to fingerprints. Satin is one of the few obscure glass patterns available in 1/2"
It is a modern simple obscure pattern. When people say frosted, this is what we suspect they mean.
Satin Glass seems to amplify the green. Low Iron or Starphire Satin is very white in comparison.
Click Here for Picture of typical Satin Installation.