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 3 220222 ,220223 ,220287 3419 Albite (*) Feldspar Na(AlSi3 O8 ) 1977.38 1677.02 3 220212 ,220287 ,220292 8803 Almandine (*) Garnet Fe2+ 3 Al2 (SiO4 )3 1977.38 1677.02 3 220217 ,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 3 220286 ,220287 ,220318 1036 Anthophyllite (*) Amphibole Mg2 Mg5 Si8 O22 (OH)2 1977.38 1507.51 0 718 Antigorite (*) Serpentine Clay Mg3 Si2 O5 (OH)4 2 220222 ,220223 708 Augite (*) Pyroxene (Ca,Mg,Fe)2 Si2 O6 1977.38 1677.02 6 220216 ,220220 ,220287 ,220315 ,220316 ,220331 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 Bismuth (*) Arsenic Bi 1 220215 1966 Calcite (*) Calcite Ca(CO3 ) 1977.38 1507.51 18 220219 ,220222 ,220236 ,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 14 220222 ,220223 ,220236 ,220247 ,220265 ,220268 ,220271 ,220287 ,220289 ,220304 ,220305 ,220306 ,220313 ,220314 27198 Chamosite (*) Chlorite Clay (Fe2+ ,Mg,Al,Fe3+ )6 (Si,Al)4 O10 (OH,O)8 1977.38 1507.51 0 577 Chromite (*) Spinel Fe2+ Cr2 O4 1 220225 3902 Chrysotile (*) Serpentine Clay Mg3 Si2 O5 (OH)4 1 220222 951 Clinochlore (*) Chlorite Clay Mg5 Al(AlSi3 O10 )(OH)8 1 220288 1756 Clinozoisite (*) Clinozoisite Epidote Ca2 Al3 [Si2 O7 ][SiO4 ]O(OH) 2 220212 ,220312 1025 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 Diamond (*) Diamond C 2 220220 ,220315 697 Diopside (*) Pyroxene CaMgSi2 O6 1977.38 1507.51 7 220222 ,220223 ,220256 ,220275 ,220287 ,220296 ,220326 4135 Dolomite (*) None CaMg(CO3 )2 1977.38 1677.02 17 220217 ,220219 ,220222 ,220223 ,220238 ,220251 ,220265 ,220266 ,220267 ,220276 ,220281 ,220287 ,220289 ,220300 ,220306 ,220308 ,220326 9895 Edenite (*) Amphibole NaCa2 Mg5 (Si7 Al)O22 (OH)2 1 220233 160 Enstatite (*) Pyroxene Mg2 Si2 O6 1 220233 944 Epidote (*) Epidote Clinozoisite Ca2 (Al2 Fe3+ )[Si2 O7 ][SiO4 ]O(OH) 1977.38 1507.51 0 8173 Epsomite (*) Epsomite Mg(SO4 )·7H2 O 1977.38 1677.02 1 220287 484 Ferro-hornblende (*) Amphibole Ca2 (Fe2+ 4 Al)(Si7 Al)O22 (OH)2 1 220223 271 Fluorapatite (*) Apatite Ca5 (PO4 )3 F 1 220292 2740 Fluorite (*) Fluorite CaF2 1 220222 9617 Gahnite (*) Spinel ZnAl2 O4 1 220292 445 Galena (*) Rocksalt PbS 2 220222 ,220297 24243 Geikielite (*) Corundum MgTiO3 1977.38 1507.51 0 70 Goethite (*) Diaspore FeO(OH) 1977.38 1507.51 34 220222 ,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 3 220215 ,220296 ,220319 30554 Graphite (*) None C 3 220230 ,220282 ,220327 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 1 220236 6890 Hedenbergite (*) Pyroxene CaFe2+ Si2 O6 1 220223 741 Hematite (*) Corundum Fe2 O3 1977.38 1507.51 39 220219 ,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 Ilmenite (*) Corundum Fe2+ Ti4+ O3 1 220222 5433 Kaolinite (*) Clay Kaolinite Al2 Si2 O5 (OH)4 4 220238 ,220267 ,220281 ,220308 5591 Laumontite (*) Not in a structural group CaAl2 Si4 O12 ·4H2 O 1 220311 1271 Lepidocrocite (*) Lepidocrocite Fe3+ O(OH) 1977.38 1507.51 0 581 Lizardite (*) Serpentine Clay Mg3 Si2 O5 (OH)4 1977.38 1507.51 0 359 Magnetite (*) Spinel Fe2+ Fe3+ 2 O4 1977.38 1507.51 35 220222 ,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 ,220323 ,220325 14899 Malachite (*) Malachite Cu2 (CO3 )(OH)2 4 220247 ,220289 ,220305 ,220314 12537 Marcasite (*) Marcasite FeS2 1977.38 1677.02 5 220219 ,220251 ,220287 ,220305 ,220306 5674 Meionite (*) Scapolite Ca4 Al6 Si6 O24 (CO3 ) 2 220222 ,220223 176 Microcline (*) Feldspar K(AlSi3 O8 ) 6 220222 ,220224 ,220228 ,220239 ,220291 ,220292 4924 Mirabilite (*) None Na2 (SO4 )·10H2 O 1977.38 1507.51 1 220236 223 Molybdenite (*) Molybdenite MoS2 1977.38 1677.02 1 220287 5800 Monazite-(Ce) (*) Monazite Ce(PO4 ) 1 220292 945 Montmorillonite (*) Clay Smectite-vermiculite (Na,Ca)0.3 (Al,Mg)2 Si4 O10 (OH)2 ·nH2 O 1 220329 1508 Muscovite (*) Mica Clay KAl2 (Si3 Al)O10 (OH)2 7 220222 ,220265 ,220276 ,220292 ,220296 ,220297 ,220329 17380 Perovskite (*) Perovskite CaTiO3 1977.38 1507.51 0 495 Phlogopite (*) Mica Clay KMg3 (AlSi3 O10 )(OH)2 3 220221 ,220222 ,220223 2273 Pigeonite (*) Pyroxene (Mg,Fe,Ca)2 Si2 O6 1 220222 303 Pyrite (*) Pyrite FeS2 1977.38 1677.02 17 220219 ,220222 ,220223 ,220236 ,220241 ,220247 ,220265 ,220271 ,220276 ,220277 ,220280 ,220283 ,220287 ,220292 ,220297 ,220305 ,220306 39462 Pyrope (*) Garnet Mg3 Al2 (SiO4 )3 6 220220 ,220221 ,220226 ,220227 ,220235 ,220331 341 Pyrrhotite (*) Nickeline Fe7 S8 1 220307 9056 Quartz (*) Quartz SiO2 1977.38 1507.51 46 220219 ,220222 ,220223 ,220236 ,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 ,220311 ,220314 61156 Rutherfordine (*) None (UO2 )(CO3 ) 1977.38 1507.51 0 58 Scheelite (*) Scheelite Ca(WO4 ) 1 220297 4894 Schorl (*) Tourmaline NaFe2+ 3 Al6 (Si6 O18 )(BO3 )3 (OH)3 (OH) 2 220292 ,220322 2705 Siderite (*) Calcite Fe(CO3 ) 4 220236 ,220265 ,220267 ,220306 6417 Silver (*) Copper Ag 1 220244 5186 Spessartine (*) Garnet Mn2+ 3 Al2 (SiO4 )3 1 220292 1214 Staurolite (*) Staurolite Fe2+ 2 Al9 Si4 O23 (OH) 1 220312 978 Talc (*) Clay Talc Mg3 Si4 O10 (OH)2 7 220222 ,220238 ,220265 ,220267 ,220281 ,220308 ,220311 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 7 220222 ,220223 ,220256 ,220275 ,220287 ,220323 ,220326 2562 Uraninite (*) Fluorite UO2 1977.38 1677.02 4 220215 ,220255 ,220287 ,220297 2718 Uranophane-α (*) None Ca(UO2 )2 (SiO3 OH)2 ·5H2 O 1 220215 890 Vermiculite (*) Clay Smectite-vermiculite Mg0.7 (Mg,Fe,Al)6 (Si,Al)8 O20 (OH)4 ·8H2 O 1977.38 1507.51 0 652 Wilcoxite (*) Aubertite MgAl(SO4 )2 F·17H2 O 1977.38 1677.02 1 220287 11 Wollastonite (*) Wollastonite CaSiO3 1 220223 1247 Xenotime-(Y) (*) Zircon Y(PO4 ) 1 220292 939 Zircon (*) Zircon Zr(SiO4 ) 3 220218 ,220222 ,220292 5251 Zoisite (*) Epidote Ca2 Al3 [Si2 O7 ][SiO4 ]O(OH) 1 220222 1025
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-00902 1536.87 1536.87 1536.87 Rb-Sr age not evaluated biotite 123853 Caspian Construction Company Quarry, Dickinson Co., Michigan, USA USGS-Rb-Sr USGS-Rb-Sr Edit USGS-Rb-Sr-00903 1615.19 1615.19 1615.19 Rb-Sr minimum age of intrusion k-feldspar 123853 Caspian Construction Company Quarry, Dickinson Co., Michigan, USA USGS-Rb-Sr USGS-Rb-Sr 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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