Mich. Comp. Laws § 2.16
State stone.
The Petoskey stone is hereby adopted as the official stone of the state of Michigan.
Michigan Compiled Laws — STATE STONE (Act 89 of 1965)
Michigan · statute · 89 of 1965, Mich. Comp. Laws · 1 active provisions
Michigan · statute · 89 of 1965, Mich. Comp. Laws · 1 active provisions
The Petoskey stone is hereby adopted as the official stone of the state of Michigan.