Well formed tetragonal orange crystals of minium in association with cherry-red cuprite octahedrons and minor cerussite and malachite composing mineralization crust over medieval Chinese bronze coin (Zhi Da Tong Bao 1308-1311 A.D. of emperor U-Zhong from Yuan dynasty 1271-1368). Additional information on the coin and its metal composition you can to find here: http://www.zeno.ru/showphoto.php?photo=44243 Bronze coins of Yuan dynasty are remarkable as matrix for minium formation. It is an usual oxidation product of such alloys. FOW 2-1.5 mm. The coin was unearthed in Xinjiang province. Pavel M. Kartashov collection and photo.
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