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Unformatted text preview: iii.The loss of volatiles is important III) Effects of metamorphism a. Recrystallization i. Pre-metamorphic minerals are transformed into larger crystals. b. Foliation i. The parallel alignment of platy minerals c. Chemical recombination i. Two or more minerals in the host rock recombine to form a new mineral without the addition of any new material. d. Chemical replacement i. New material is combined with host rock minerals to produce a new mineral. e. Index minerals i. Minerals that define specific temperatures and pressure of formation. IV) Metamorphic textures\ a. Foliation i. Slate 1. Very fine cleavage 2. Fissile a. Break easily along cleavage plane ii.Phyllite 1. Waxy/greasy look on the surface. iii.Schist 1. Coarse foliation a. Visible micas iv.Gneiss 1. Very coarse foliation 2. Light and dark bands in rock v.Marble 1. Metamorphosed limestone vi.Quartzite 1. Metamorphosed sandstone...
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- Spring '08