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Size: 2 to 8 microns. (Scale earlier calibrated at 56 microns per division at 5x, so 5.6 microns at 50x) There is clumping of particles thru much of the sample.
Shape: Rounded, somewhat irregular
Color: Medium green
Transparency: Transparent
Homogeneity: Homogeneous except for minor size variation.

This appears to be a precipatated green pigment. Additional information is needed to complete the identification. It is viridian.