Agregate of pearly transparent changoite plates over old zink Vietnamese coin. FOV ~3x2 mm. Matrix coin is Gia Long Thong Bao (1802-1820) zink 7 van. More information about the coin and its metal composition is available here: http://www.zeno.ru/showphoto.php?photo=34770&ppuser=933 Pavel M. Kartashov collection and photo.
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