Can anyone help me identify this piece?

I have this piece that I purchased from an estate sale where the woman was quite the collector of many signed Navajo, Hopi and Zuni pieces (most of which I’ve been able to identify the artists). I’m having a hard time with this one. First, I’d love help with the name of the artist. Also, is this piece turquoise? And, is it a slide pendant? Thank you!

This is Navajo made. I found a hallmark that might be the artist, Andrew Martin. I would call this Fox Turquoise. It is a very nice piece.