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Early Days of X-ray Crystallography$
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André Authier

Print publication date: 2013

Print ISBN-13: 9780199659845

Published to Oxford Scholarship Online: September 2013

DOI: 10.1093/acprof:oso/9780199659845.001.0001

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Unravelling The Mystery of Crystals: The Forerunners

Unravelling The Mystery of Crystals: The Forerunners

Chapter:
(p.270) 11 Unravelling The Mystery of Crystals: The Forerunners
Source:
Early Days of X-ray Crystallography
Author(s):

André Authier

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780199659845.003.0011

This chapter recounts the early attempts at guessing the inner structure of crystals. The Ancients thought quartz was the result of the congelation of water. The first to think that the symmetry of quartz was due to a hexagonal packing of elementary particles, in the manner of the honeycomb, was Cardano (1550), but the first serious considerations of the different ways to pack globules were by Kepler in his study of six-cornered snowflakes. These ideas were taken up by Hooke and Bartholin. Huygens explained the double refraction of calcite by a stacking of prolate ellipsoids, Guglielmini related the external shapes of crystals to their shapes at the start of growth, and Bergman showed that the calcite scalenohedron can be interpreted as a stacking of cleavage rhombohedra. Our understanding of crystals was further improved by the observation of the constancy of interfacial angles by Steno in quartz, and observation generalized to all crystals by Carangeot and Romé de l’Isle.

Keywords:   calcite, cleavage, crystals, double refraction, Huygens, Kepler, snowflakes, Steno, quartz, Romé de l’Isle

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