Maltese cross (optics)

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This article is about polymers. For other uses, see spherulite.
Maltese crosses in an image of polyamide-6,6 spherulites

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.

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