Abstract
Meteorites are important as samples of parent-bodies formed early in the history of the Solar System, and later disrupted. Many stony meteorites have extremely complex structures. Particularly in “unequilibrated” chondrites and in gas-rich meteorites, much of the material is fine-grained and using optical methods can only be described as “unresolved matrix” or in similar terms. In a few selected meteorites we are studying the nature of such material and its relation to the coarser grains by HVEM (at 1 MV) of ion-thinned specimens. The extra penetration afforded at high voltages is essential because one cannot make significant areas of the inhomogeneous samples thin enough for study at 100 kV (minerals thin at different rates; some grains also fall out). In such material, it is often convenient to work in dark field, since this minimizes unwanted thickness-contrast, while a sufficient number of grains can be brought into diffraction contrast to illustrate grain morphology and intragranular substructures.
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Ashworth, J.R., Barber, D.J. (1976). Stony Meteorites. In: Wenk, HR. (eds) Electron Microscopy in Mineralogy. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-66196-9_42
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DOI: https://doi.org/10.1007/978-3-642-66196-9_42
Publisher Name: Springer, Berlin, Heidelberg
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