🪨 Chlorastrolite
Michigan's state gem. Green pumpellyite mineral found in Keweenaw Peninsula basalts, known as Isle Royale Greenstone.
Best Places to Find Chlorastrolite
Isle Royale Greenstone Beaches
Isle Royale, Michigan · National Park
Hunt for chlorastrolite (Isle Royale greenstone) — Michigan's state gem. Found on Isle Royale beaches. Limited collecting permitted in National Park.