Etta Mine, Keystone, Keystone Mining District, Pennington County, South Dakota, USA | β Albite, β Alluaudite, β Almandine, β Andalusite, β Arrojadite-(KFe), β Arsenolite, β Azurite, β Baryte, β Beryl, β Biotite, β Bismuth, β Cacoxenite, β Carbonate-rich Fluorapatite, β Cerussite, β Chalcocite, β Chalcopyrite, β Corundum, β DufrΓ©nite, β Elbaite, β Epidote, β Eucryptite, β Ferrisicklerite, β Frondelite, β Galena, β Goethite, β Graphite, β Heterosite, β Ilmenite, β Jahnsite-(CaMnMg), β Kaolinite, β Lepidolite, β LΓΆllingite, β Microcline, β Mitridatite, β Molybdenite, β Monazite-(Ce), β Montmorillonite, β Mushistonite, β Opal, β Petalite, β Phosphosiderite, β Pseudomalachite, β Quartz, β Rockbridgeite, β Scheelite, β Schorl, β Siderite, β Sphalerite, β Spinel, β Stewartite, β Strengite, β Tapiolite, β Tavorite, β Titanite, β Triplite, β Wolframite Group, β Xanthoxenite, β Zircon |