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Mimetite is a lead arsenate chloride mineral (Pb5(AsO4)3Cl) which forms as a secondary mineral in lead deposits, usually by the oxidation of galena and arsenopyrite. The name derives from the Greek Μιμητής (mimetes), meaning "imitator," and refers to mimetite's resemblance to the similar mineral pyromorphite. This focus-stacked photograph shows a 3 cm × 1.7 cm × 1 cm (1.18 in × 0.67 in × 0.39 in) sample of mimetite collected from the Congreso-León mines in the Mexican state of Chihuahua.Photograph credit: Ivar Leidus
"The game of chess is not merely an idle amusement; several very valuable qualities of the mind are to be acquired and strengthened by it, so as to become habits ready on all occasions; for life is a kind of chess." — American philosopher, scientist, and author Benjamin Franklin
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