Multimedia small, decorative Aztec burial mask

This mask is about 6" high x 5" wide x 2.5" deep. It appears to be made of glass, stone or resin and some type of shell, maybe abalone shell. It is sealed with a clear layer on front and some sort of binding layer on back, which is a chipped away in one corner. I can see that there is black glass in that area. I bought it from a college professor and his wife who are downsizing and during his career had visitors from all over the world. They could not remember who gifted it to them. Their guess was that it is a representation of an Aztec or Mayan death mask. I found only a couple examples of somewhat similar masks but nothing that really leads me to a good conclusion about where and when it was made. It feels kind of touristy to me, though it is pretty nice quality. Maybe a gift shop item? Odd little thing so I bought it as a research opportunity.

Oops! Looks like someone posted one of these to CW years ago:

https://www.collectorsweekly.com/stories/98452-aztec-burial-mask-lapis-quartz-onyx

There is more information in the comments of this post. Unfortunately, the link in the comments to the maker's site is no longer good.