Vintage Native American Malachite? Turquoise? and Silver Cross

This is what I believe to be green malachite - I don't think it's turquoise but I also could be mistaken. No guarantees on that one. Either way the stones are old and so pretty and set down in the sterling silver cross. Unmarked but obviously genuine silver and stone. Similar items online seemed to indicate this could be a Zuni piece, but again, I simply don't know. What is certain is it's old and so lovely. Lightweight but solid for all its tiny size.