Eudialyte crystal, mounted with c perpendicular to the spindle axis

A eudialyte (hexagonal) crystal is mounted with its c-axis perpendicular to the axis of rotation of the spindle stage and rotated through 90 degrees on the spindle stage. The three videos below show the crystal in plane polarized (nothing too cool), cross-polarized (the optic axis rotates from perpendicular to the microscope stage to parallel to the microscope stage causing an increase in retardation), and lastly, in conoscopic light (the crystal rotates from a centered optic axis figure to a centered flash figure).

Plane polarized light

Cross polarized light

Conoscopic illumination

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