MICK JAGGER has never released a memoir . . . but he HAS written one. A publisher named John Blake says he wrote a 75,000-word manuscript back in the early '80s.

Mick got an advance of about $1 million, and was set up with a ghostwriter to help him out. Everything was going fine until the manuscript was rejected . . . because it was, quote, "too light on sex and drugs."

Apparently, that killed the project. Blake says the manuscript is great though.  Quote, "It’s extraordinary.  I compared it to, like, the Dead Sea Scrolls . . . It's delicious, heady stuff."

He's been trying to get Mick to agree to release the book as-is, but he isn't interested. In fact, Mick doesn't even remember writing it in the first place....and he has no intention of releasing any sort of autobiography any time soon. 

A few years ago, Mick said, quote, "If someone wants to know what I did in 1965, they can look it up on Wikipedia."