Real fur or synthetic one?

I inherited a coat from my mom.

I would like to know if it’s real fur or fake one.

• I read online that it could be discovered by the needle and burn tests.

I believe the coat was bought 20/30years ago.

there’s no tag on it.

what kind of fur could be? I know zero about the subject, I was told it could be blue fox.

how much is its worth money wise?