Also found in: Encyclopedia, Wikipedia.


 (sfîr′yə-līt′, -ə-līt′, sfĕr′-)
A small, usually spheroidal body consisting of radiating crystals, found in obsidian and other glassy lava rocks.

spher′u·lit′ic (-lĭt′ĭk) adj.


(Minerals) any of several spherical masses of radiating needle-like crystals of one or more minerals occurring in rocks such as obsidian
spherulitic adj


(ˈsfɛr yʊˌlaɪt, ˈsfɪər-)

a rounded aggregate of radiating crystals found in obsidian and other glassy igneous rocks.
Mentioned in ?
References in periodicals archive ?
Reduction of spherulite size is long known to be the key to an effective clarification for i-PP [17, 18].
The set of lamellae packaged in parallel is called fibrils, in which the unitary cell of PHB is arranged so that the axis "a" is oriented parallel to the radius of the spherulite [63].
Towards the apex, the calcite crystals in the spherulites continue growing only until a new spherulite is formed (Fig.
The spherulite size reflect the crystallization kinetics of the polymer [20].
Figure 1(a) is an optical micrograph showing the grown crystal as spherulite and square platelet.
Spherulite morphology is observed when samples are melt or solution cast.
POM showed that the spherulite number of PLLA increased and the spherulite size significantly reduced in the presence of NA.
In Case 1 the spherulites are separated and show large droplets on their surface, while in Case 4 coarse spherulite results including PS droplets.
They added a clarifying agent such as a dibenzylidene sorbitol acetal derivative, reducing spherulite sizes, which reduces light scattering and maintains clarity.
By using a suitable nucleating agent, the spherulite size could also be decreased, so that the optical clarity and mechanical properties of the product can be improved [12, 13].
Figure 4b shows the lateral sectioned plane of self-organized 2D crystalline microstructure with inset representing the surface morphology of 2D spherulite.