Answer A

Your answer: Petoskey

Correct! The Michigan state stone is the Petoskey stone. 

Answer B

Your answer: Greenstone

Not quite. Greenstone, also known as Chlorastrolite, is Michigan's state gem. The Petoskey stone is the state stone. 

Answer C

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.