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RT @GeologyTime:Colorful pyrite cube!! Interesting nature striation on the surface!! Very nice color!! Locality: Anhui province, Ch… https://t.co/D5SXDdWKiB
Sep 29
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It is time to submit videos for the Move Mining Next Gen contest! Join this online competition for students K-12 to… https://t.co/8DMNLGfnVZ
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