7. What is the % of Quartz: in Felsic rocks ....% in Intermediate rocks... ....

Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
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7. What is the % of Quartz:
in Felsic rocks
...%
in Intermediate
rocks. .
%
Transcribed Image Text:7. What is the % of Quartz: in Felsic rocks ...% in Intermediate rocks. . %
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The rocks on the basis of silica-content are classified into three categories. Felsic rocks are those, which have silica-content more than 65%. If silica is between 55 and 65%, these rocks are termed as intermediate. If silica content is found between 45 to 55 percent in the rocks, rocks are termed as mafic and if silica content is below 45%, rocks are known as ultramafic.

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