GEO 303 Chapter Notes - Chapter 5: Pyroxene, Schist, Amphibole
24 Dec 2017
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Document Summary
Metamorphism is a solid state transformation. Metamorphic rocks are classified by texture and mineral assemblage. Making new minerals from original minerals, or changing. Parallel alignment of microscopic platy minerals (mainly mica). Parallel, but wavy, foliation of fine-grained platy minerals (mainly mica. Parallel to sub-parallel foliation of medium to coarse-grained platy minerals. Low-grade metamorphism and chlorite) exhibiting a shiny or glossy luster. low-grade metamorphism. Discontinuous light and dark layering due to mineral segregation. Minerals present in a metamorphic rock depend upon: 1. bulk chemical composition of the parent rock. Although a mineral assemblage may change with increasing grade of metamorphism, Change the bulk chemical composition of the original parent rock commonly does (except for loss of water at higher grades). Index minerals are diagnostic minerals that indicate a restricted range of. General order of appearance with increasing grade of metamorphism: Mica appears (clay disappears) garnet and staurolite appear; amphibole increases .
