Abstract
OPTICAL activity is theoretically possible in crystals belonging to the non-enantiomorphous classes m, mm2, &4macr; and &42macr;m; but only one substance has ever been cited as an example1. This is the dimer of the β-form of methyl mesityl oxide oxalate (C9H12O4)2, which was assigned by Sommerfeldt2 to class m on the basis of morphological measurements.
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References
Wooster, W. A., “Crystal Physics”, 154 (Camb. Univ. Press, 1938).
Sommerfeldt, E., “Neues Jahrbuch für Mineralogie”, 1, 58 (1908).
Voigt, W., Phys. Z., 7, 267 (1906).
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ROGERS, D. Alleged Optical Activity in Crystal Class m. Nature 171, 929 (1953). https://doi.org/10.1038/171929a0
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DOI: https://doi.org/10.1038/171929a0
