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Metamorphism


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Author Topic: Metamorphism  (Read 1458 times)
Rebecca
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« Reply #15 on: May 29, 2007, 11:36:48 pm »

Schistosity

The layering in a coarse grained, crystalline rock due to the parallel arrangement of platy mineral grains such as muscovite and biotite. Other minerals present are typically quartz and feldspar, plus a variety of other minerals such as garnet, staurolite, kyanite, sillimanite.



      At intermediate and high grades of metamorphism the chlorite breaks down and recrystallizes to form quartz, feldspar, and mica. The grain size also increases and individual mineral grains can be seen with the unaided eye.
     Foliation in coarse grained metamorphic rocks is called SCHISTOSITY. In a hand sample the foliation can be easily seen, and ususally runs planar through the rock; that is, it all runs the same direction. In larger specimens, however, the foliation may be folded. Schistosity is derived from the Latin schistos meaning cleaves easily. Schistosity differs from slaty cleavage in both grain size and mineral content.
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