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NA511 - Acanthite $ 750 Guanajuato, Mexico thumbnail - 2 x 1.8 x 1.3 cm ex. John Barlow Large cubic crystals of metallic grey Acanthite from Guanajuato, Mexico. A superb, complete and pristine thumbnail sized specimen from the John Barlow collection (Barlow specimen #3561). ©2010-2018 Marin Mineral |