geology - metamorphic rocks

1. METAMORPHISM AND METAMORPHIC ROCKS

9. CONTACT/THERMAL METAMORPHISM

13. Spotted slate

14. andalusite

15. porphyroblasts Poikiloblast of cordierite (poikilitic texture)

16. hornfels

18. metaquartzite

19. marble

24. Table 2 Common Metamorphic Rocks Rock Parent Rock Key Minerals Metamorphic Environment Foliated Slate Shale Clay minerals, micas. chlorite. graphite Relatively low temperature and pressure Foliated Schist Shale, basalt, graywacke sandstone, impure limestone Mica, chlorite, garnet, talc, epdiodte, hornblende, graphite, staurite, kyanite Intermediate - to - high temperature and pressure Foliated Gneiss Shale, felsic igneous rocks, graywacke, sandstone, granite, impure limestone Garnet, mica, augite, hornblende, staurolite, kyanite, sillimanite High Temperature and pressure Nonfoliated Marble Pure limestone calcite, dolomite Contact with hot magma, or confining pressure from deep burial Nonfoliated Quartzite Pure sandstone, chert Quartz Contact with hot magma, or confining pressure from deep burial