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Related Concept Videos

Carbon Skeletons01:12

Carbon Skeletons

Life on Earth is carbon-based, as all macromolecules that make up living organisms contain carbon atoms. All organic compounds have a carbon backbone. Each carbon atom is tetravalent and can bond with four other atoms, making it an extraordinarily flexible component of biological molecules. Because carbon’s valence electrons are stable, it rarely becomes an ion. As the carbon chain increases in length, structural modifications such as ring structures, double bonds, and branching side chains...
Network Covalent Solids02:18

Network Covalent Solids

Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...

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Related Experiment Video

Updated: Jun 24, 2026

Characterization of Ultra-fine Grained and Nanocrystalline Materials Using Transmission Kikuchi Diffraction
09:13

Characterization of Ultra-fine Grained and Nanocrystalline Materials Using Transmission Kikuchi Diffraction

Published on: April 1, 2017

Graphitic carbon in the Allende meteorite: a microstructural study.

P P Smith1, P R Buseck

  • 1Department of Geology, Arizona State University, Tempe 85251, USA.

Science (New York, N.Y.)
|April 17, 1981
PubMed
Summary
This summary is machine-generated.

Carbon in the Allende meteorite is mainly poorly crystalline graphite. This graphite is significant as it carries isotopically anomalous noble gases found in carbonaceous chondrites.

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Last Updated: Jun 24, 2026

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Area of Science:

  • Cosmochemistry
  • Materials Science

Background:

  • Carbonaceous chondrites provide insights into early solar system materials.
  • Understanding the form and properties of carbon is crucial for cosmochemical studies.

Purpose of the Study:

  • To characterize the microstructural properties of carbon within the Allende carbonaceous chondrite.
  • To identify the form of carbon that hosts isotopically anomalous noble gases.

Main Methods:

  • High-resolution transmission electron microscopy (HRTEM) was employed.
  • Microstructural analysis of carbonaceous material.

Main Results:

  • The carbon in the Allende meteorite is predominantly poorly crystalline graphite.
  • This poorly crystalline graphite is a significant carrier of isotopically anomalous noble gases.

Conclusions:

  • The microstructural state of carbon influences its role in preserving presolar materials.
  • Poorly crystalline graphite in carbonaceous chondrites is key to understanding noble gas anomalies.