Practice Session

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selfQT.indigo.xpol.20x.mpeg

These transparent blue particles appear to have two different shapes, rods and an irregular shape. Light across the entire particle appears to be very uniform like piece of flat blue glass. This suggests uniform thickness, perhaps a plate-like particle. Particle size ranges from 1x10 to 5x60 microns for the rods and upto 30x120 microns for the irregularly shaped particles (review the section on measurements if necessary). As the stage is rotated under crossed polars, extinction is observed, therefore the material is anisotropic. Careful observation shows anomolous polarization colors (variation in the blue depending upon the side of extinction).