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A spherical body or coarsely crystalline aggregate having a radial internal structure arranged about one or more centers.



a small sphere consisting of an aggregate of very fine acicular crystals radiating from a central point. Spherulites are found in magmatic and sedimentary rocks and vary in mineral composition and size. In magmatic rocks, spherulites are usually interpreted as endogenic contact formations in the marginal sections of diorites. In acidic lavas, they may occur through consolidation when the primary glassy mass cools; in basic lavas (variolites), such formations are called varióles. Spherulites also form in gas bubbles of already hardened rock during secondary precipitation of zeolites, quartz, and similar minerals; in such cases they may be called pseudospherulites. Carbonate, iron-manganese phosphate, chalcedonic, and other types of spherulites are found in sedimentary rocks. They usually result from the crystallization of material in colloidal nodules, and many are close in origin to concretions.

References in periodicals archive ?
The increase in the density of spherulite cores indicates a reduction in the size of spherulites, which may result in an improvement of optical performance.
52] present a study that relates the spacing increase of bands and the radius of spherulites with the increase of temperature of crystallization of PHB.
Calcite crystals emerge from spherulites and diverge towards the external walls of the rostra as parallel to sub-parallel prismatic crystals with locally curved faces (Fig.
In early 1972, DuPont changed the manufacturing process to prevent these large spherulites from forming.
It was noted that surfaces were irregular, and contained a nonhomogeneous distribution of spherulites and the top and bottom of the samples were not uniform.
Thus, mixed GdCaHM crystal grows as single crystal with square platelet as well as spherulites.
The lamellae are typically organized into spherulites with the proper thermal history.
As a typical semi-crystalline polymer material, iPP exhibits hierarchical crystalline structures including spherulites, lamellae, and crystal unit cells.
In semi-crystalline polyolefins, crystallites form aggregates, resulting in structures such as spherulites or fibrils.
The size of spherulites were decreased by the incorporation of Nanoclay into the polymer matrix.