black / red mineral 7b Red 2.5 4 6 Red Abundant Large Poor Angular Quartz SiO2 YR range 0.2 Plagioclase NaAlSi3O8 – -1.0 mm CaAl2Si2O8 Olivine (Mg,Fe)2SiO4 Monticellite Ca(Mg,Fe)2SiO4 9 Pale red 5 YR 5 6 Abundant Mostly Poor Sub Quartz SiO2 red 0.1 -0.2 angular Calcite CaCO3 mm with and Plagioclase NaAlSi3O8 – fewer rounded CaAl2Si2O8 larger 1.0 -1.5 mm Sanidine (K,Na)AlSi3O8
black / red mineral 7b Red 2.5 YR 4 6 Red Abundant Large range 0.2 -1.0 mm Poor Angular Quartz SiO2 Plagioclase NaAlSi3O8 – CaAl2Si2O8 Olivine (Mg,Fe)2SiO4 Monticellite Ca(Mg,Fe)2SiO4 9 Pale red 5 YR 5 6 red Abundant Mostly 0.1 -0.2 mm with fewer larger 1.0 -1.5 mm Poor Sub angular and rounded Quartz SiO2 Calcite CaCO3 Plagioclase NaAlSi3O8 – CaAl2Si2O8 Sanidine (K,Na)AlSi3O8
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