Can you answer this "multi-purpose" riddle?!

Question: From green I changed to black, then they carefully crushed me, and into fine gold they finally transformed me.
What is it?

Answers: From green I changed to black, then they carefully crushed me, and into fine gold they finally transformed me.
What is it?

oil or dope

uhhh... corn???

A leaf that got burnt and then the stuff inside was turned into a gold consumer product. :p

Tea leaves?

sounds like dope

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