Chapter 22 Ans

Chapter 22 Ans - Answers for Chapter 22: A Classification...

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Answers for Chapter 22: A Classification of Metamorphic Rocks 1. What do a slate and a phyllite have in common? They are both fine grained and foliated metamorphic rocks, typically of pelitic origin. How are they distinguished from one another? Slates are duller and phyllites have a “satiny” sheen. What is responsible for the difference? The sheen is due to the development of fine micaceous minerals that become large enough to re- flect light, but not so large to be recognized without a microscope. 2. What does a schist have in common with a slate and phyllite? A schist is also a foliated metamorphic rocks, typically of pelitic origin. 3. How does schistosity differ from cleavage? Schistosity involves the alignment of mineral grains that are recognizable without the aid of a mi- croscope. 4. What distinguishes a gneiss from a schist? A gneiss has a banded appearance in which quartzofeldspathic minerals are partly segregated from micas, amphiboles, etc. 5.
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Chapter 22 Ans - Answers for Chapter 22: A Classification...

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