It’s a lovely crystal! 
I wish I was more confident about spotting real ones - there was a discussion a while back (here: Is selenite really selenite?) about how some less reputable crystal shops/sellers label satin spar as selenite. I just don’t know enough to be able to tell them apart, so it’s not one I keep in my collection.
For those who are lucky and have selenite, it is loaded with lovely associations and uses 
Thanks for sharing your wisdom, Megan - this is a great list! 