Detrital grains of which mineral(s) are extremely rare in detrital sediments? Why?
A) Feldspars; they occur only in granites.
B) Calcite; it is soft and relatively soluble.
C) Clays; they are rare in soils and regolith.
D) Quartz; it is very hard and insoluble.
Correct Answer:
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A)Lignite
B)Chert
C)Travertine
D)Gypsum
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