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- noun Plural form of
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The mica does not everywhere present this coarsely crystalline appearance, but in flexures and lines of union with the quartz and orthoclase is degraded to a mica schist upon whose surfaces appear uranates of lime and copper (autunite and torbernite), and in which are inclosed garnet crystals of considerable size and beauty.
The uranates, in which the oxide of uranium acts as an acid, are mostly insoluble and of secondary importance.