6. Spherulites or microcrystals.
Spherulites: transparent birefringent clusters.
This is a good point for optimization.
Try additives or seeding.
Spherulites can look like droplets.
Spherulites can look like transparent clusters.
When using polarized light, spherulites show dark and light parts.
Out of spherulites grown crystals.
Microcrystals after streak seeding.
Microcrystals are small particles where edges and birefringence are visible if the magnification is high enough.