 | | Report (issue) | | gov/images/periodictable.pdf. Cover. Left, centimeter-size pyrochlore crystals from Uganda. Photograph by Gunnar Ries/CC-BY-SA-3.....M4 M4. Photographs showing centimeter-size pyrochlore crystals from Uganda, and a tantalite crystal...subsurface geology of the Saint-Honoré carbonatite complex in southern Quebec, Canada, and a schematic north-south...showing niobium resources and reserves in Brazil, Canada, and the United States...........................primarily derived from the complex oxide minerals of the pyrochlore group ((Na,Ca,Ce)2 (Nb,Ti,Ta)2 (O |  | | Report (issue) | | Survey has produced this volume to describe a select group of mineral commodities currently critical to our...antimony in China; niobium in Brazil; and platinum-group elements in South Africa and Russia), thus increasing...same commodities. Rare-earth elements and platinum-group elements particularly are broadly viewed as critical...lithium (Li), manganese (Mn), niobium (Nb), platinum-group elements (PGE), rare-earth elements (REE), rhenium...........................M1 Chapter N. Platinum-Group Elements By Michael L. Zientek, Patricia J. Loferski |
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