Mineral name Structural Groups IMA Formula Max Age (Ma) Min Age (Ma) # of Sublocalities containing mineral LOCALITY IDs, not mindat ids # of localities containing mineral Actinolite (*) Amphibole Ca2 (Mg4.5-2.5 Fe2+ 0.5-2.5 )Si8 O22 (OH)2 1977.38 1677.02 1 220287 3419 Albite (*) Feldspar Na(AlSi3 O8 ) 1977.38 1677.02 2 220287 ,220292 8803 Almandine (*) Garnet Fe2+ 3 Al2 (SiO4 )3 1977.38 1677.02 2 220287 ,220292 2353 Andradite (*) Garnet Ca3 Fe3+ 2 (SiO4 )3 1977.38 1677.02 2 220287 ,220297 1534 Anorthite (*) Feldspar Ca(Al2 Si2 O8 ) 1977.38 1677.02 2 220286 ,220287 1036 Augite (*) Pyroxene (Ca,Mg,Fe)2 Si2 O6 1977.38 1677.02 1 220287 2060 Azurite (*) Not in a structural group Cu3 (CO3 )2 (OH)2 3 220240 ,220247 ,220289 5509 Baryte (*) Baryte Ba(SO4 ) 1 220265 11547 Bertrandite (*) Not in a structural group Be4 Si2 O7 (OH)2 1 220292 606 Beryl (*) Beryl Be3 Al2 Si6 O18 1977.38 1677.02 3 220287 ,220292 ,220297 4286 Calcite (*) Calcite Ca(CO3 ) 1977.38 1507.51 15 220241 ,220247 ,220264 ,220265 ,220267 ,220271 ,220275 ,220277 ,220280 ,220287 ,220292 ,220304 ,220305 ,220306 ,220308 27770 Chalcanthite (*) Chalcanthite Cu(SO4 )·5H2 O 1977.38 1677.02 1 220287 925 Chalcopyrite (*) Chalcopyrite CuFeS2 1977.38 1677.02 9 220247 ,220265 ,220268 ,220271 ,220287 ,220289 ,220304 ,220305 ,220306 27198 Clinochlore (*) Chlorite Clay Mg5 Al(AlSi3 O10 )(OH)8 1 220288 1756 Columbite-(Fe) (*) Columbite Fe2+ Nb2 O6 2 220292 ,220297 518 Copiapite (*) Copiapite Fe2+ Fe3+ 4 (SO4 )6 (OH)2 ·20H2 O 1977.38 1677.02 1 220287 382 Copper (*) Copper Cu 2 220262 ,220280 3846 Cryptomelane (*) Coronadite K(Mn4+ 7 Mn3+ )O16 1 220303 599 Cummingtonite (*) Amphibole Mg2 Mg5 Si8 O22 (OH)2 1977.38 1677.02 1 220287 327 Diopside (*) Pyroxene CaMgSi2 O6 1977.38 1507.51 4 220256 ,220275 ,220287 ,220296 4135 Dolomite (*) None CaMg(CO3 )2 1977.38 1677.02 12 220238 ,220251 ,220265 ,220266 ,220267 ,220276 ,220281 ,220287 ,220289 ,220300 ,220306 ,220308 9895 Epsomite (*) Epsomite Mg(SO4 )·7H2 O 1977.38 1677.02 1 220287 484 Fluorapatite (*) Apatite Ca5 (PO4 )3 F 1 220292 2740 Gahnite (*) Spinel ZnAl2 O4 1 220292 445 Galena (*) Rocksalt PbS 1 220297 24243 Goethite (*) Diaspore FeO(OH) 1977.38 1507.51 33 220238 ,220240 ,220241 ,220243 ,220244 ,220245 ,220247 ,220253 ,220257 ,220258 ,220259 ,220261 ,220263 ,220264 ,220265 ,220266 ,220267 ,220271 ,220275 ,220276 ,220277 ,220278 ,220283 ,220285 ,220287 ,220293 ,220294 ,220295 ,220301 ,220302 ,220305 ,220306 ,220309 7437 Gold (*) Copper Au 1 220296 30554 Graphite (*) None C 1 220282 2812 Grayite (*) Rhabdophane (Th,Pb,Ca)(PO4 )·H2 O 1 220292 17 Greenalite (*) Clay Serpentine (Fe2+ ,Fe3+ )2-3 Si2 O5 (OH)4 1 220240 61 Grunerite (*) Amphibole Fe2+ 2 Fe2+ 5 Si8 O22 (OH)2 1977.38 1677.02 2 220252 ,220287 223 Gypsum (*) Gypsum Ca(SO4 )·2H2 O 1977.38 1507.51 0 6890 Hematite (*) Corundum Fe2 O3 1977.38 1507.51 38 220238 ,220240 ,220241 ,220243 ,220244 ,220245 ,220246 ,220247 ,220253 ,220257 ,220258 ,220259 ,220261 ,220263 ,220264 ,220265 ,220266 ,220271 ,220275 ,220276 ,220277 ,220278 ,220280 ,220281 ,220283 ,220285 ,220287 ,220292 ,220293 ,220294 ,220295 ,220301 ,220302 ,220304 ,220305 ,220306 ,220308 ,220309 14640 Hydroxylapatite (*) Apatite Ca5 (PO4 )3 OH 1 220289 367 Kaolinite (*) Clay Kaolinite Al2 Si2 O5 (OH)4 4 220238 ,220267 ,220281 ,220308 5591 Magnetite (*) Spinel Fe2+ Fe3+ 2 O4 1977.38 1507.51 32 220238 ,220240 ,220241 ,220243 ,220244 ,220245 ,220247 ,220252 ,220253 ,220257 ,220258 ,220259 ,220261 ,220263 ,220264 ,220265 ,220266 ,220267 ,220271 ,220275 ,220276 ,220277 ,220278 ,220283 ,220285 ,220287 ,220293 ,220294 ,220295 ,220301 ,220302 ,220309 14899 Malachite (*) Malachite Cu2 (CO3 )(OH)2 3 220247 ,220289 ,220305 12537 Marcasite (*) Marcasite FeS2 1977.38 1677.02 4 220251 ,220287 ,220305 ,220306 5674 Microcline (*) Feldspar K(AlSi3 O8 ) 3 220239 ,220291 ,220292 4924 Mirabilite (*) None Na2 (SO4 )·10H2 O 1977.38 1507.51 0 223 Molybdenite (*) Molybdenite MoS2 1977.38 1677.02 1 220287 5800 Monazite-(Ce) (*) Monazite Ce(PO4 ) 1 220292 945 Muscovite (*) Mica Clay KAl2 (Si3 Al)O10 (OH)2 5 220265 ,220276 ,220292 ,220296 ,220297 17380 Pyrite (*) Pyrite FeS2 1977.38 1677.02 13 220241 ,220247 ,220265 ,220271 ,220276 ,220277 ,220280 ,220283 ,220287 ,220292 ,220297 ,220305 ,220306 39462 Pyrrhotite (*) Nickeline Fe7 S8 1 220307 9056 Quartz (*) Quartz SiO2 1977.38 1507.51 40 220238 ,220239 ,220240 ,220241 ,220243 ,220244 ,220245 ,220246 ,220247 ,220253 ,220257 ,220258 ,220259 ,220261 ,220263 ,220264 ,220265 ,220266 ,220267 ,220271 ,220275 ,220276 ,220277 ,220278 ,220280 ,220281 ,220283 ,220285 ,220287 ,220292 ,220293 ,220294 ,220295 ,220297 ,220301 ,220302 ,220305 ,220306 ,220308 ,220309 61156 Scheelite (*) Scheelite Ca(WO4 ) 1 220297 4894 Schorl (*) Tourmaline NaFe2+ 3 Al6 (Si6 O18 )(BO3 )3 (OH)3 (OH) 1 220292 2705 Siderite (*) Calcite Fe(CO3 ) 3 220265 ,220267 ,220306 6417 Silver (*) Copper Ag 1 220244 5186 Spessartine (*) Garnet Mn2+ 3 Al2 (SiO4 )3 1 220292 1214 Talc (*) Clay Talc Mg3 Si4 O10 (OH)2 5 220238 ,220265 ,220267 ,220281 ,220308 3337 Tantalite-(Fe) (*) Columbite Fe2+ Ta2 O6 1977.38 1677.02 2 220287 ,220292 99 Tapiolite-(Fe) (*) Tapiolite Fe2+ Ta2 O6 1 220292 88 Titanite (*) Titanite CaTi(SiO4 )O 1 220297 4899 Tremolite (*) Amphibole Ca2 (Mg5.0-4.5 Fe2+ 0.0-0.5 )Si8 O22 (OH)2 1977.38 1507.51 3 220256 ,220275 ,220287 2562 Uraninite (*) Fluorite UO2 1977.38 1677.02 3 220255 ,220287 ,220297 2718 Wilcoxite (*) Aubertite MgAl(SO4 )2 F·17H2 O 1977.38 1677.02 1 220287 11 Xenotime-(Y) (*) Zircon Y(PO4 ) 1 220292 939 Zircon (*) Zircon Zr(SiO4 ) 1 220292 5251
Excel ID Max Age (Ma) Min Age (Ma) Age as listed in reference Dating Method Age Interpret Prioritized? Sample Source Sample Num Run Num Age from other Locality Dated Mineral Minerals explicitely stated as having this age Age applies to these Elements MinDat Locality ID Dated Locality (Max Age) Location as listed in reference Reference Reference DOI Reference ID Age Notes Edit USGS-Rb-Sr-00912 1556.45 1556.45 1556.45 Rb-Sr initial age disturbed by later metamorphism biotite 16267 Metropolitan Mine, Metropolitan, Menominee Iron Range, Dickinson Co., Michigan, USA USGS-Rb-Sr USGS-Rb-Sr Edit USGS-Rb-Sr-00913 1703.29 1703.29 1703.29 Rb-Sr initial age disturbed by later metamorphism muscovite Muscovite 16267 Metropolitan Mine, Metropolitan, Menominee Iron Range, Dickinson Co., Michigan, USA USGS-Rb-Sr USGS-Rb-Sr Edit USGS-Rb-Sr-00915 1507.51 1507.51 1507.51 Rb-Sr initial age disturbed by later metamorphism biotite 16267 Metropolitan Mine, Metropolitan, Menominee Iron Range, Dickinson Co., Michigan, USA USGS-Rb-Sr USGS-Rb-Sr Edit USGS-Rb-Sr-00914 1977.38 1977.38 1977.38 Rb-Sr initial age disturbed by later metamorphism muscovite Muscovite 11628 Groveland Mine, Randville, Menominee Iron Range, Dickinson Co., Michigan, USA USGS-Rb-Sr USGS-Rb-Sr Edit USGS-Rb-Sr-00958 1677.02 1677.02 1677.02 Rb-Sr initial age disturbed by later metamorphism k-feldspar 11628 Groveland Mine, Randville, Menominee Iron Range, Dickinson Co., Michigan, USA USGS-Rb-Sr USGS-Rb-Sr
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