Kinesiology 1080A/B Lecture Notes - Lecture 7: Gneiss, Feldspar, Phyllite
13 Nov 2014
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He could ask give the mineral name, or rock name, properties, he will not ask streak lecture colour or fracture for minerals. He will post a file on owl for the test format. These rocks are subjected to great heat and pressure. Heat: most important drives chemical reactions and recrystallization of host rocks. * heat is one of the most important factors. Heat comes from magma bodies under the earth especially in the core of the mountain. If sand stone is cooked enough it can turn into quartz crystals. Recrystallization and size is a common factor after heat is applied. Pressure: increases with depth; confining pressure and directed pressure. Chemical activity: ions in solution (mainly water) exchange with ions in minerals of the parent rock to form new minerals. Pressure coming from all directions occurs in the rock called confining pressure. Differential pressure is when there is pressure occurring only in certain directions.
