What is the most common type of rock on Jupiter?

It is currently unknown what the most common type of rock on Jupiter is, as it is a gas giant and does not have a solid surface. Jupiter's atmosphere is primarily composed of hydrogen and helium, with trace amounts of other gases such as methane, water vapor, and ammonia.

Although Jupiter does not have a solid surface, it does have a rocky core, which is believed to be made up of heavy elements such as iron, nickel, and silicates. However, due to the extreme pressure and temperature within Jupiter, the exact composition of its core is still a matter of scientific investigation and debate.