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Metamorphic Rock. “Changed” rock that forms deep under the Earth. Texture and composition of a sedimentary or igneous or other metamorphic rock gets changed by heat and pressure. HOW?. Rock gets close to magma This is called CONTACT metamorphism. Also.
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“Changed” rock that forms deep under the Earth • Texture and composition of a sedimentary or igneous or other metamorphic rock gets changed by heat and pressure
HOW? • Rock gets close to magma • This is called CONTACT metamorphism
Also . . . • Enormous pressure when the Earth’s crust collides • Called REGIONAL Metamorphism
Minerals Change… • Calcite, Quartz and Hematite change into GARNET
Textures: • Foliated mineral grains banded, aligned • Nonfoliatedminerals crystals are larger, not aligned; they appear shiny
Examples… • Foliated: slate, schist, gneiss
Schist http://flexiblelearning.auckland.ac.nz/rocks_minerals/rocks/schist.html
Gneiss http://flexiblelearning.auckland.ac.nz/rocks_minerals/rocks/gneiss.html
Nonfoliated • Marble, • quartzite (is very common)
Learn these changes • Shale slate gneiss • Limestone marble • Sandstone quartzite • Coal Anthracite Coal
Homework Visit: http://www.es.ucl.ac.uk/schools/Glossary/rocks.htm