Maltese cross (optics)

In polymer physics, Maltese Cross is a set of four symmetrically disposed sectors of high extinction that is displayed when a polymer is observed under polarized lights. This is usually observed when trying to observe spheruliltes in polymers.

This article is about polymers. For other uses, see spherulite.
Maltese crosses in an image of Polyamide 6.6 spherulites
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