Questions and Answers
What is the minimum iron composition required for iron-rich sedimentary rocks?
15%
Which type of iron-rich sedimentary rock is mainly Precambrian in age?
Iron formations
What is the main difference between iron formations and ironstones?
Age and iron composition
Which of the following is NOT a type of iron mineral found in ironstones?
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What distinguishes native or telluric iron from ironstone?
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Study Notes
Iron-Rich Sedimentary Rocks
- Minimum iron composition required for iron-rich sedimentary rocks is 15% iron oxide.
Types of Iron-Rich Sedimentary Rocks
- Banded Iron Formations (BIFs) are mainly Precambrian in age.
Iron Formations vs. Ironstones
- Main difference between iron formations and ironstones is the presence of silica in iron formations, whereas ironstones are silica-poor.
Iron Minerals
- Iron minerals found in ironstones include hematite, siderite, and chamosite, but pyroxene is NOT a type of iron mineral found in ironstones.
Native Iron vs. Ironstone
- Native or telluric iron is distinguished from ironstone by its formation through natural weathering processes, whereas ironstone is a sedimentary rock.
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Description
Learn about the abundance of iron in the earth's crust and the presence of iron in sedimentary rocks. Explore the composition and classification of iron-rich sedimentary rocks.
