The scientific term for the star phenomenon in gemstones is Asterism...astrid is pretty close to that. Or you could use Aster for a middle if you don't use astrid.
Originally Posted by EmilytheStrange
Aster and Astar are pretty.. but they're not the same
The only other thing that would work is 'Garnet', since it's the Star Garnet that is so special to Idaho, but I don't really like Garnet as a name.