Throughout the nineteenth century and the early decades of the twentieth century the description of the morphology of both natural and artificial crystals on the basis of goniometric measurement was an important activity of most mineralogists and of some chemists. By far the most comprehensive compilation of the data so produced is Paul Groth's Chemische Krystallographie, Vols. I–V (1906–1919, Engelmann, Leipzig), which covers over 7000 substances. The arrangement is chemical and the crystallographic data are not presented in a form suitable for determinative purposes.
E. von Fedorow, the first to derive the 230 space groups and the inventor of the two-circle goniometer and the universal stage, attempted to devise a scheme for the identification of crystalline substances on the basis of morphology. In theory, such a scheme should be applicable to all but isometric crystals, since the interfacial angles of all other crystals are, in general, characteristic for each substance. The work...
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References
Pabst, A., 1965. The Barker index of crystals, 1951–1964, Science, 149, 45–46.
Terpstra, P., and Codd, L. W., 1961. Crystallometry. New York: Academic Press, 420p.
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© 1981 Hutchinson Ross Publishing Company
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Pabst, A. (1981). Barker index of crystals . In: Mineralogy. Encyclopedia of Earth Science. Springer, Boston, MA. https://doi.org/10.1007/0-387-30720-6_15
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DOI: https://doi.org/10.1007/0-387-30720-6_15
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