SRM 688 - Basalt Rock 60 g

NIST - STANDARD REFERENCE MATERIALS Rock and Minerals (powder form) Additional Information gt; gt; (Concentrations are in mass fractions, in %, unless noted by an asterisk for mg/kg) Parameter Value Aluminum Oxide (Al2O3) 17.36 Calcium oxide 12.17 Chromium Trioxide (Cr2O3) 332* Ferric Oxide (Fe2O3**) 10.35 FeO** 7.64 Magnesium oxide 8.4 Manganese 0.167 Phosphorus Oxide (P2O5) 0.134 Potassium Oxide (K2O) 0.187 Rubidium Oxide (Rb2O) 1.91* Silicon Dioxide (SiO2) 48.4 Sodium Oxide (Na2O) 2.15 Strontium oxide 169.2* Titanium Dioxide (TiO2) 1.17