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Hackmanite (Mont Saint-Hilaire Complex, Early Cretaceous, ~122-133 Ma; Mont Saint-Hilaire, Quebec, Canada)
James St. John a posté une photo : Hackmanite from the Cretaceous of Quebec, Canada. Hackmanite is a sulfur-bearing sodium chloro-aluminosilicate, Na8Al6Si6O24Cl2 - it's one of th...