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Unformatted text preview: crystals perpendicular to compressional forces (stress) is called foliation (Figure 2.25). Foliation is unique to many metamorphic rocks and gives them a layered or banded appearance. Metamorphic rocks are divided into two groups based on texturefoliated and nonfoliated. These tex-tural divisions provide the basis for the identification of metamorphic rocks. Foliated Metamorphic Rocks The mineral crystals in foliated metamorphic rocks are either elongated or have a sheet structure and are arranged in a parallel or "layered" manner. During metamorphism, increased heat and pressure can cause the mineral crystals to become larger and the foliation more ob-vious. The metamorphic rocks in Figures 2.16-2.20 ex-hibit foliated textures. 21. From the rocks illustrated in Figures 2.16 and 2.18, was it the (slate, schist) resulted from more intensive heat and pressure?...
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- Summer '10