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bastnasite

A greasy, wax-yellow to reddish-brown weakly radioactive mineral, (Ce,La)(CO3)F , most commonly found in contact zones, less often in pegmatites; found associated with allanite, cerite, tysonite, fluorite, and tornebohmite; hexagonal; obtained from Ryddarhyttan and Finbo, Sweden; Pikes Peak, CO, and Mountain Pass, CA.

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