Rock_Identification_14 - Select several of the foliated...

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Select several of the foliated metamorphic rock specimens supplied by your instructor that have large crystals and examine them with a hand lens. 22. From the metamorphic rocks in Figures 2.17 and 2.19, the (phyllite, gneiss) shows the minerals separated into light and dark bands. Circle your answer. (The foliated- banded texture of the rock that you have selected often results from the most intensive heat and pressure during metamor-phism.) 23. Sketch the appearance of the magnified crystals of one foliated metamorphic rock in the space pro- vided below. Indicate the scale of your sketch by writing the appropriate length within the () pro- vided on the bar scale. /
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Figure 2.25 Metamorphic rock textures. A. A foliated texture results when elongated mineral crystals are aligned in a parallel, linear arrangement perpendicular to the compressional force (stress). The layered or banded appearance that results is evident in the photomicrograph (enlarged photograph taken through a microscope) of slate. B. When mineral crystals are not elongated,
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This note was uploaded on 04/03/2011 for the course PHYS 114 taught by Professor Comptonw during the Summer '10 term at Purdue University-West Lafayette.

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Rock_Identification_14 - Select several of the foliated...

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