Book contents
- Ordinary Chondrites
- Cambridge Planetary Science
- Ordinary Chondrites
- Copyright page
- Dedication
- Other Books by Alan E. Rubin
- Additional material
- The Fall
- Contents
- Preface
- Introduction
- 1Approaches to Experimental and Observational Science
- 2Meteorite Classification
- 3A Few Essential Definitions
- 4Ordinary-Chondrite Abundances in Different Mass Ranges
- 5Asteroids
- 6Carbonaceous and Noncarbonaceous Materials in the Solar System
- 7Delivery of Meteorites to the Earth
- 8Fall Phenomena Icon of a magic wand used to represent editing or enhancement tools.
- 9Terrestrial Weathering
- 10Ordinary-Chondrite Groups
- 11Physical Components of Ordinary Chondrites
- 12Mineralogy of Ordinary Chondrites
- 13Parent-Body Processes
- 14Parent-Body Collisional Histories
- 15Magnetic Fields in the Solar Nebula
- 16Ordinary-Chondrite Formation
- Epilogue
- References
- Index
12 - Mineralogy of Ordinary Chondrites
Published online by Cambridge University Press: 24 February 2026
Book contents
- Ordinary Chondrites
- Cambridge Planetary Science
- Ordinary Chondrites
- Copyright page
- Dedication
- Other Books by Alan E. Rubin
- Additional material
- The Fall
- Contents
- Preface
- Introduction
- 1Approaches to Experimental and Observational Science
- 2Meteorite Classification
- 3A Few Essential Definitions
- 4Ordinary-Chondrite Abundances in Different Mass Ranges
- 5Asteroids
- 6Carbonaceous and Noncarbonaceous Materials in the Solar System
- 7Delivery of Meteorites to the Earth
- 8Fall Phenomena Icon of a magic wand used to represent editing or enhancement tools.
- 9Terrestrial Weathering
- 10Ordinary-Chondrite Groups
- 11Physical Components of Ordinary Chondrites
- 12Mineralogy of Ordinary Chondrites
- 13Parent-Body Processes
- 14Parent-Body Collisional Histories
- 15Magnetic Fields in the Solar Nebula
- 16Ordinary-Chondrite Formation
- Epilogue
- References
- Index
Summary
Tiny presolar grains include C polymorphs, carbides, nitrides, oxides, silicates, metallic Fe-Ni, and organic compounds. Rare CAIs and AOAs contain refractory oxides and silicates. Major phases in type-3 OC include olivine and low-Ca pyroxene with variable FeO/(FeO+MgO), metallic Fe-Ni, troilite, and nearly exclusively within chondrules, crystallites of Ca-pyroxene, rare pigeonite, and tiny grains of merrillite. Whole-rock thermal metamorphism produced secondary phases: orthopyroxene, diopside, chromite, ilmenite, rutile, phosphate, and plagioclase. Diffusion facilitated by metamorphism causes increasing compositional homogeneity in olivine and pyroxene. Some minerals and mineraloids are formed at high shock pressure. These include lingunite and maskelynite from plagioclase; ahrensite, asimowite, poirierite, ringwoodite, and wadsleyite from olivine; akimotoite, bridgmanite, hemleyite, hiroseite, and majorite from orthopyroxene; chenmingite and xieite from chromite; tuite from merrillite; wangdaodeite from ilmenite; and TiO2-II from rutile. Parent-body aqueous alteration produced phyllosilicates, Ni-rich sulfides, Ni-rich metal phases, carbides, oxides, and small calcite crystals.
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- Ordinary ChondritesThe Most Common Meteorites, pp. 235 - 262Publisher: Cambridge University PressPrint publication year: 2026
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