spherical carbonaceous mesophase

https://doi.org/10.1351/goldbook.S05856
A term which describes the morphology of carbonaceous mesophase which is formed in the isotropic pitch matrix. The spherical carbonaceous mesophase usually has a lamellar structure consisting of flat aromatic molecules arranged in parallel layers which are perpendicular to the sphere/isotropic phase interface. On coalescence, this spherical mesophase loses its characteristic morphology and is converted to the bulk mesophase.
Source:
PAC, 1995, 67, 473. 'Recommended terminology for the description of carbon as a solid (IUPAC Recommendations 1995)' on page 505 (https://doi.org/10.1351/pac199567030473)