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Oxide and Cation Compositions of Olivine Grains from Drill Core in the Duluth Complex, Minnesota The table contains oxide and cation compositions of olivine grains from drill core of the Duluth Complex, Minnesota. The oxides were determined by electron probe microanalysis (EPMA) and are reported in weight percent (wt%). The cations were calculated based on the oxide compositions and are reported in mole percent (mol%). Olivine is a magnesium iron orthosilicate mineral with the formula (Mg2+, Fe2+)2SiO4. Olivine forms a solid solution series with magnesium (Mg) at one end and iron (Fe) at the other. Forsterite (Mg2SiO4) is the magnesium endmember and fayalite (Fe2SiO4) is the iron endmember. Minor elements can substitute into the crystal structure, such as manganese (Mn) and nickel (Ni). To better understand... Categories: Data; Types: Citation; Tags: Cook County, Duluth, Environmental Health, Geochemistry, Lake County, All tags... Mineralogy, Minnesota, St. Louis County, USGS Science Data Catalog (SDC), electron microscopy, mineralogy, Fewer tags Oxide and Cation Compositions of Pyroxene Grains from Drill Core of the Duluth Complex, Minnesota The table contains oxide and cation compositions of pyroxene grains from drill core in the Duluth Complex. The oxides were determined by electron probe microanalysis (EPMA) and are reported in weight percent (we%). The cations were calculated from the oxide concentrations and are reported in mole percent (mol%). Pyroxene minerals are a group of rock-forming inosilicate minerals with calcium (Ca), iron (Fe), and magnesium (Mg) endmembers. Wollastonite (Wo) is the Ca-endmember with the formula Ca2Si2O6. Ferrosilite (Fs) is the Fe-endmember with the formula Fe2Si2O6, and enstatite (En) is the Mg-endmember with the formula Mg2Si2O6. In order to better understand the chemical compositions of the pyroxenes, the percent... Categories: Data; Types: Citation; Tags: Cook County, Duluth, Environmental Health, Geochemistry, Lake County, All tags... Mineralogy, Minnesota, St. Louis County, USGS Science Data Catalog (SDC), electron microscopy, mineralogy, Fewer tags Oxide and Cation Compositions of Feldspar Grains from Drill Core of the Duluth Complex, Minnesota The table contains oxide and cation compositions of feldspar grains from drill core of the Duluth Complex. The oxides were determined by electron probe microanalysis (EPMA) and are are reported in weight percent (wt%). The cations were then calculated and are reported in mole percent (mol%). Feldspar grains are a group of rock-forming tectosilicate minerals with potassium (K), sodium (Na), and calcium (Ca) endmembers. Anorthite has a chemical formula CaAlSi3O8; albite has the formula NaAlSi3O8; and orthoclase has the chemical formula KAlSi3O8. To better understand the composition of the measured feldspars, we calculated the anorthite content (An%) as (Ca/(Ca+Na+K)) x 100 and report the values in mol%. Albite (Ab%)... Categories: Data; Types: Citation; Tags: Cook County, Duluth, Environmental Health, Geochemistry, Lake County, All tags... Mineralogy, Minnesota, St. Louis County, USGS Science Data Catalog (SDC), electron microscopy, mineralogy, Fewer tags