Open AccessAn X-ray investigation of optically anomalous crystals of racemic potassium chlorosulphoacetate
Publication year - 1927
Publication title -
proceedings of the royal society of london. series a, containing papers of a mathematical and physical character
Language(s) - English
Resource type - Journals
eISSN - 2053-9150
pISSN - 0950-1207
DOI - 10.1098/rspa.1927.0037
Subject(s) - orthorhombic crystal system , tetragonal crystal system , crystallography , crystal (programming language) , potassium , symmetry (geometry) , chemistry , materials science , crystal structure , mathematics , geometry , computer science , organic chemistry , programming language
A crystallographic description of racemic potassium chlorosulphoacetate, {|CHCI.SO3 KCOOK + 1½ HO, has been given by Rathke and Doelter who came to different conclusions with regard to the crystal symmetry. Rathke described the crystals as tetragonal, Doelter as orthorhombic. Recently, in a detailed investigation of crystals of this substance by F. M. Jaeger, it was shown that the crystals are apparently orthorhombic-bipyramidal and markedly pseudotetragonal. The axial ratio is :—a :b :c : = 0·9973 : 1 : 2·7650. The beautiful crystals which were used in the last-mentioned investigation showed remarkable optical anomalies. For particulars concerning them reference should be made to the original paper. To avoid misunderstanding only the general appearance of these anomalies may be described here :—