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  • Journal of weekly news and commentaries about rocks …

    lc John Betts - Fine Minerals, New York, NY Dealers of Fine Minerals and Natural Crystal Clusters since 1989. Journal of weekly news and commentaries about rocks and minerals and mineral collecting -

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    Rare-earth element: Rare-earth element, any member of the group of chemical elements consisting of three elements in Group 3 (scandium [Sc], yttrium [Y], and lanthanum [La]) and the first extended row of elements below the main body of the periodic table (cerium [Ce] through lutetium [Lu]). The elements cerium through

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    Fig. 1. a. Cross section through the Hagendorf-North pegmatite, SE Germany. The underground workings are shown by the galleries and shafts and rises.

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  • EM 1110-2-2901 Tunnels and Shafts in Rock | …

    EM 1110-2-2901 Tunnels and Shafts in Rock - Ebook download as PDF File (.pdf), Text File (.txt) or read book online.