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IGNEOUS ROCK TEXTURE C Coarsed Ex: granite Fine Ex: rhyolite IGNEOUS ROCKS TEXTURE C GLASSY EX: OBSIDIAN PUMICE PORPHYRITIC EX: ANDESITE This is an extrusive porphyritic rock, as the pink (and black) phenocrysts are clearly visible, in contrast the grey groundmass with its microscopic crystals. IGNEOUS ROCK COMPOSITION GRANITIC EX: GRANITE BASALTIC EX: BASALT. SEDIMENTARY ROCK BASED ON HOW THEY ARE FORMED CLASTIC EX: SANDSTONE CHEMICAL & BIOCHEMICAL EX:LIMESTONES HOW METAMORPHIC ROCKS ARE FORMED? CONTACT METAMORPHISM EX: MARBLE REGIONAL METAMORPHISM DURING MOUNTAIN BUILDING AGENTS OF METAMORPHISM HEAT -drives chemical PRESSURE HYDROTHERMAL SOLUTIONS reaction causing minerals to -causes spaces recrystallize between minerals to -promote close -comes from recrystallization magma & change in temperature with depth -increases with depth -applied in all CLASSIFICATION OF METAMORPHIC ROCKS NONFOLIATED FOLIATED EX: MARBLE EX: GNEISS (NICE)