spherulite

https://doi.org/10.1351/goldbook.S05859
A polycrystalline, roughly spherical @MT07285@ consisting of lath, fibrous or lamellar crystals emanating from a common centre. Space filling is achieved by branching, bending or both, of the @C01281@ fibres or lamellae.
Source:
Purple Book, 1st ed., p. 83 [Terms] [Book]