I have been trying to find a list of native american jewelry hallmarks so that I can identify the mark on a brooch that I aqquired. Any help would be appreciated

There are some on this link page
Jewelry Hallmarks

You can look up native american sites
Such as this one
Tumbleweeds Jewelry - TOP NATIVE AMERICAN ARTISTS

And there are quite a bit of posts on this board
Here are a few but there are more here
Ask Me Help Desk - Search Results

Amazon also has books that have native american hallmarks

I found two other sites that had american indian artists directories and hallmark info that might help you out. The first one is: Indian Native American pictograph hallmarks

And the second one is:
Knowledge Center - Native American Artists - A - Z Artists - Alltribes.com