If you could drill a hole into it where that groove is on the blank side then you could turn it into a necklace so you can carry it with you all the
time.
I can imagine it being very precious to you, I know if I had something like that I'd cherish it. Take good care of it!
Dont know anything really about rocks, but your rock looks like a treasure mate I quess you already had some at least semi-professional answers
of what it is, but it certainly looks like a treasure to me