system
Given the following post, respond as if you're commenting on Reddit:
human
Is a non-hydrogen based star possible?

Is it possible for a star to be primarily composed of heavier elements such as lithium or beryllium? Or even heavier?
gpt
Stars on other phases of their lives are mostly not composed of hydrogen anymore.
Some types of red giant stars has consumed all of it's lighter fuel, and it's burning other elements, mostly helium.

Look up Red clump and Stellar Evolution on wikipedia. Good read.

Heavy elements, up to Iron can be found being used as fuel on late phase stars.
When hydrogen is up, the star stars to burn helium, producing heavier elements, and so on.
During it's life cycle, stars burn heavier and heavier elements, until they reach Iron, then shit hits the fan.

EDIT: Clarification.