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Geosciences LibreTexts

7.4: Activity 7C - Determining Igneous Rock Compositions

  • Page ID
    14554
  • 7.18.png
    Figure 7.18: Activity 7C, determine the igneous compositions of rocks A-D.
    1. For Rock A, determine:

    1. The relative percentage of SiO2 vs. Fe and Mg:

    1. The Color Index and associated igneous composition:

    1. For Rock B, determine:

    1. The relative percentage of SiO2 vs. Fe and Mg:

    1. The Color Index and associated igneous composition:

    1. For Rock C, determine:

    1. The relative percentage of SiO2 vs. Fe and Mg:

    1. The Color Index and associated igneous composition:

    1. For Rock D, determine:

    1. The relative percentage of SiO2 vs. Fe and Mg:

    1. The Color Index and associated igneous composition:

    Attributions

    • Figure 7.18: “Igneous Compositions” (CC-BY 4.0; Chloe Branciforte, own work)