To establish that chiral bipyramids give qualitatively the same polarimetric properties as the QW-MOF, we examined first a chiral test crystal, ethylene diammonium sulfate (EDS) whose optical properties we have studied in detail. EDS can have an isohedral tetragonal bipyramidal morphology but with perfect cleavage normal to the optic axis. The LB of EDS is smaller than that for QW-MOF, giving larger linear distances between orders in projection of 80 microns. The CR micrographs (See Fig. ) oblique to the optic axis could be compared with those of QW-MOF qualitatively; the sense of the CR progression was dependent on the crystal chirality. The enantiomorph could be easily established in sections normal to the optic axis where LR = 0 by symmetry. Moreover, the quantitative OR was found to be 15 deg/mm which matches the value derived from the constitutive tensors for single crystals determined previously.