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Từ điển American Heritage Dictionary 4th
gummite
 gum·mite (gŭmʹīt)n.
An orange-red to grayish yellow mixture of several uranium oxides, silicates, and salts occurring naturally in the oxidation and hydration of uraninite. [German Gummit, from Gummi, gum, from Middle High German, from Medieval Latin, from Latin. See gum1.]
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