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