Observe an animation of metamorphic rocks forming
http://www.classzone.com/books/earth_science/terc/content/visualizations/es0607/es0607page01.cfm?chapter_no=visualization

Matthew Nyman, Lenni Armstrong, Exploring Earth


The Flash animation shows the evolution of granitic igneous rock to a metamorphic rock focusing on changes in alignment of amphibole, plagioclase feldspar, and quartz crystals. An inset provides a close up of how pressure compresses mineral grains and forms new minerals. The animation can be paused and rewound to stress important points.

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This resource is referenced here:Keywords: metamorphic rocks, rock cycle, mineralogy