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1. State Gem, Isle Royale Greenstone

Description:
On reverse: "Chlorastrolite (Greenstone) - is the "official state gem" of Michigan. It is a variety of the mineral pumpellyite and is found chiefly as small, green, rounded beach pebbles, showing a turtleback pattern. Greenstones can still be found on Isle Royale and on some of the mine waste piles of the Copper Country, although it is a rare mineral".
Data Provider:
Capital Area District Library (Lansing, MI). Forest Parke Library and Archives
Collection:
Caterino Postcard Collection

2. State Gem, Isle Royale Greenstone

Description:
On reverse: "Chlorastrolite (Greenstone) - is the "official state gem" of Michigan. It is a variety of the mineral pumpellyite and is found chiefly as small, green, rounded beach pebbles, showing a turtleback pattern. Greenstones can still be found on Isle Royale and on some of the mine waste piles of the Copper Country, although it is a rare mineral".
Data Provider:
Capital Area District Library (Lansing, MI). Forest Parke Library and Archives
Collection:
Caterino Postcard Collection