Abstract
Coesite is a high-pressure polymorph of silica stable in the pressure range 2.5–9 GPa, which corresponds to a minimum depth in Earth of ca. 90 km. Given the ubiquity of silica at the surface of the Earth, coesite represents a good marker of high-pressure processes. Coesite exhibits a monoclinic symmetry with space group C12/c1. Cell parameters are a = 0.71356, b = 1.23692 and c = 0.71736 nm, with β = 120.34°. While monoclinic in symmetry, the coesite lattice has almost hexagonal dimensions with a chex/ahex ratio of 1.73. It is thus possible to describe the coesite structure within a pseudohexagonal cell.
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© 2008 Springer-Verlag Berlin Heidelberg
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Cordier, P., Jacob, D., Schertl, H.P. (2008). Characterization of a (021) twin in coesite using LACBED and precession electron diffraction. In: Richter, S., Schwedt, A. (eds) EMC 2008 14th European Microscopy Congress 1–5 September 2008, Aachen, Germany. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-85226-1_402
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DOI: https://doi.org/10.1007/978-3-540-85226-1_402
Publisher Name: Springer, Berlin, Heidelberg
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