Your answer: Petoskey
Correct! The Michigan state stone is the Petoskey stone.
Your answer: Greenstone
Not quite. Greenstone, also known as Chlorastrolite, is Michigan's state gem. The Petoskey stone is the state stone.
Your answer: Lake Superior Agate
A Lake Superior agate is a type of quartz found on the shores of Lake Superior. These beautiful stones are not the Michigan state stone, however. Michigan's state stone is the Petoskey stone.