late neoproterozoic overprinting of the cassiterite and columbite grinding mill

late neoproterozoic overprinting of the cassiterite and columbite grinding mill

The aplitic facies is characterized by a sodolithic composition with lepidolite, albite, montebrasite, and quartz as major minerals; some muscovite, topaz,cassiterite,and columbite-tantalite can also occur [30, 31]. In both facies, secondary phosphates are also present, resulting fromlatealteration processes

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