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Questions and Answers
What is the minimum iron composition required for iron-rich sedimentary rocks?
What is the minimum iron composition required for iron-rich sedimentary rocks?
- 15% (correct)
- 20%
- 6.47%
- 10%
Which type of iron-rich sedimentary rock is mainly Precambrian in age?
Which type of iron-rich sedimentary rock is mainly Precambrian in age?
- Limonite rocks
- Ironstones
- Siderite rocks
- Iron formations (correct)
What is the main difference between iron formations and ironstones?
What is the main difference between iron formations and ironstones?
- Location of formation
- Color and texture
- Age and iron composition (correct)
- Type of iron minerals present
Which of the following is NOT a type of iron mineral found in ironstones?
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?
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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