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Table 2 Mineralogical composition of fresh basalt, calculated using the chemical composition given by Markusson and Stefansson (2011). Molar mass = 228.63 g/mol and density = 3.1 g/cm3

From: Differential alteration of basaltic lava flows and hyaloclastites in Icelandic hydrothermal systems

Mineral Formula M % mol
Albite NaAlSi3O8 262.223 0.16
Anorthite CaAl2Si2O8 277.41 0.24
Diopside CaMgSi2O6 216.55 0.25
Enstatite Mg2Si2O6 200.7774 0.08
Forsterite Mg2SiO4 140.6931 0.09
Fayalite Fe2SiO4 203.773 0.16
Magnetite Fe3O4 231.54 0.02