A crystallite is a small or even microscopic crystal which forms, for example, during the cooling of many materials. Crystallites are also referred to as grains.

Polycrystalline structures composed of crystallites. Clockwise from top left:
a) malleable iron
b) electrical steel without coating
c) solar cells made of multicrystalline silicon
d) galvanized surface of zinc
e) micrograph of acid etched metal highlighting grain boundaries

Bacillite is a type of crystallite.[1] It is rodlike with parallel longulites.[2]

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