IGNEOUS ROCK COMPOSITION IGNEOUS ROCKS CLASSIFIED THE EIGHT MOST ABUNDANT ELEMENTS DOMINANCE OXYGEN SILICON MADE UP SILICATE MINERALS GENERALLY DIVIDED LIGHT AND DARK THE DARK FERROMAGNESIAN PRESENCE IRON MAGNESIUM AMPHIBOLE BIOTITE MUSCOVITE FELDSPAR SOLIDIFICATION MAGMA DIVERSITY MINERAL MAKE UP GENERAL EXTREME ROCKS QUARTZ FELDSPARS GRANITIC DARK MATTER SILICA SAID TO BASALTIC ORGANIZATION CONTINUOUS VARIATION EXTREMES BOWEN MODEL THE PROCESS MAGMA PICTURES CAUSES COMPOSITION OF MINERAL RESOURCES ROCK HYPERPHYSICS GEOPHYSICS NAVE GO BACK TEXTURE TERM OVERALL APPEARANCE CRYSTALS THE TABLE BELOW THE COMMON GRAINED CRYSTAL BACKGROUND SOLID RAPID QUENCHING FRAGMENTS ELEMENTS EIGHT MAGMAS CLICK ELEMENT CRUST DIFFERENCES VARIATIONS THE OTHER BEYOND MANGANESE TITANIUM PRESENT CONCENTRATIONS THEREFORE APPEAR NUMBER TABLE