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Contents of 5.5 How are sedimentary rocks classified?

5.5 How are sedimentary rocks classified?

• Two primary categories of sedimentary rocks
• Clastic/detrital: composed mainly of mineral grains weathered from pre-existing rock and cemented together by precipitated minerals.
• Chemical/biogenic: composed of minerals precipitated from water by biologic or inorganic processes, or the remains of organisms.
• Texture and composition
• Textural terms dominate clastic nomenclature.
• Composition dominates chemical nomenclature.