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3) within pegmatitc veins 8 to 15 m thick (composed primarily of coarse-grained olivine and quartz) situated among gray gneisses Carburanium sometimes replaces uranitite crystals or forms a crust on their surface.
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9
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4243063786
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4 at 140° and 2200C, and HCl at 60°C, producing ∼1 mg of white residue.
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10
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4243169046
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note
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The polycrystalline aggregates were >95 atomic % C with trace amounts of Si, O, Fe, Al, Mg, and Ti The yttrium phosphate crystals exhibited trace amounts of Dy, Er, Gd, and Yb Carburanium is usually associated with rare-earth minerals such as zirtolite, xenotime, monazite, and uraninite.
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4243137098
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No graphite was observed in the residues, indicating its complete dissolution by the acid treatments.
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4243128051
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We thank Y. Shukolyukov and A. Fisenko for providing the carburanium acid residues and T. Bematowicz and R Walker for valuable comments.
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