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Related Concept Videos

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...
Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
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High Pressure Single Crystal Diffraction at PX^2
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Carbonado: natural polycrystalline diamond.

L F Trueb, E C De Wys

    Science (New York, N.Y.)
    |August 22, 1969
    PubMed
    Summary

    Carbonados are unique diamond aggregates with porous structures. These aggregates contain crystalline inclusions, primarily orthoclase, impacting their geological properties.

    Area of Science:

    • Geology
    • Mineralogy
    • Materials Science

    Background:

    • Carbonados are polycrystalline diamond aggregates.
    • They exhibit significant porosity and xenomorphic crystallite structures.

    Purpose of the Study:

    • To characterize the composition and structure of carbonados.
    • To identify the nature of crystalline inclusions within carbonados.

    Main Methods:

    • Microscopic analysis of carbonado samples.
    • Identification of mineral phases through crystallographic and chemical methods.

    Main Results:

    • Carbonados consist of diamond crystallites (0.1–20 microns).
    • Pores contain up to 3% crystalline inclusions.

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  • Inclusions are mainly orthoclase, with minor igneous, metamorphic, and secondary minerals.

    • Conclusions:

    • The composition of carbonados suggests a complex formation environment.
    • Inclusions provide insights into the geological history and origin of carbonados.