There is a top god. It is Zeus, God of Lighting or ares but mostly Zeus
It's worth mentioning that the Greeks viewed all of their gods as being omnipotent. Zeus was considered most powerful by virtue of his station, but there were places in the world were Poseidon, and even Apollo, were considered most important.
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Either Zeus, Hades, or Poseidon because the are all sons of Kronos an evil titan I prefer Posiedon because he is the god of the sea and much of the world is made up of sea.
There is no actual Greek god of crystals. If you mean land formations, i.e., crystals, it would be Pluto, god of the underworld.
He is Greek god, but he does have a roman version Jupiter
the greek god hermes the god of messages
There is no Greek god mercury, he was a roman god, and he was the god of war and weapons.
The Greek god of sleep was Hypnos.