mesoamerican artifacts

Hi! As I promised in my intro the other day, I am starting to post items I have obtained recently. They come from a family friend, ex diplomat, who passed away. It is a collection of mostly Mesoamerican artifacts he obtained in the 50's in Mexico. That is all I know of the provenance...

Made of amethyst possibly? I can elaborate more on where I found and what I did and where it was and all those things if I catch some interest from some of the people on this form which I'm trying to do to educate myself further dot-dot-dot