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Pellets of 99.9% pure argon-arc remelted hafnium, with visible crystalline structures. The colors are a thin-film effect in the oxide layer; this chemical element is generally a lustrous, silvery gray, tetravalent transition metal. Hafnium is widely used in filaments and electrodes, as well as in some superalloys. Photograph: Heinrich Pniok
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from Wikipedia picture of the day feed http://ift.tt/1PvP1t6
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