Samples were observed under polarized light in a photomicroscope Axiophot, Zeiss, Germany with 5X and 10 X work objectives Figure 2 so as to determine existing bi-refringence.
Fueron observados con luz polarizada en un fotomicroscopio Axiophot, Zeiss, Germany con objetivos de trabajo 5X y 10X Figura 2 y se determinó la birrefringencia existente.