REE-Nb-Zr occurrence, Pennington Mountain, Aroostook County, Maine, USA | ⓘ Aeschynite, ⓘ Albite, ⓘ Allanite Group, ⓘ Amygdaloid, ⓘ Baryte, ⓘ Basalt, ⓘ Bastnäsite, ⓘ Betafite (of Hogarth 1977), ⓘ Biotite, ⓘ Breccia, ⓘ Carbonatite, ⓘ Cassiterite, ⓘ Chlorite Group, ⓘ Clastic sedimentary rock, ⓘ Clay minerals, ⓘ Columbite-(Fe)-Columbite-(Mn) Series, ⓘ Dacite, ⓘ Dolerite, ⓘ Eudialyte, ⓘ Euxenite-(Y), ⓘ Feldspar Group, ⓘ Fersmite, ⓘ Fluorite, ⓘ Galena, ⓘ Greenschist, ⓘ Greywacke, ⓘ Hematite, Hornblende, ⓘ Ilmenorutile, ⓘ Jarosite, ⓘ K Feldspar, ⓘ Lapillistone, ⓘ Loparite-(Ce), ⓘ Lueshite, ⓘ Magnetite, ⓘ Monazite, ⓘ Natroniobite, ⓘ Parisite, ⓘ Pegmatitic granite, ⓘ Peperite, ⓘ Peralkaline alkali-feldspar-granite, ⓘ Perthite, ⓘ Prehnite, ⓘ Pumpellyite Subgroup, ⓘ Pyrite, ⓘ Pyrochlore Supergroup, ⓘ Pyroclastic-rock, ⓘ Quartz, ⓘ Rhombohedral Carbonate, ⓘ Rhyolite, ⓘ Rhyolitic tuff, ⓘ Rutile, ⓘ Sediment, ⓘ Sedimentary rock, ⓘ Siderite, ⓘ Slate, ⓘ Soil, ⓘ Sphalerite, ⓘ Synchysite, ⓘ Thorite, ⓘ Trachyte, ⓘ Tuff, ⓘ Volcanic rock, ⓘ Zircon |