spherulite

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spher·u·lite

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

spher′u·lit′ic (-lĭt′ĭk) adj.

spherulite

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

spher•u•lite

(ˈsfɛr yʊˌlaɪt, ˈsfɪər-)

n.
a rounded aggregate of radiating crystals found in obsidian and other glassy igneous rocks.
[1815–25]
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References in periodicals archive ?
These two maxima are linked to the different spherulite growth rates of the a and a' crystal modifications, the one at higher temperature is associated to growth of a spherulites, the one at lower temperature is linked to a' crystals [56, 57], The addition of PPC does not affect the position of the two maxima, but produces a sizeable increase of the rate of crystal growth of both crystal modifications, with some slightly more pronounced effect for the a crystals.
In semi-crystalline polyolefins, crystallites form aggregates, resulting in structures such as spherulites or fibrils.
In order to lead active ingredients directly to the melanocyte, the heart of the targeted zone, these ingredients have been encapsulated in Spherulites.
In thin section these large ash layers consist of calcitic plant ash with embedded reed and grass phytoliths associated with occasional animal dung spherulites (Canti 1999), suggesting the presence of dung fuel (Figure 3f).
Both images show that big spherulites grow due to the isothermal conditions but especially in the interface between surrounding powder and molten areas both materials are significantly different.
The lamellae are typically organized into spherulites with the proper thermal history.
For example, it has been firmly verified by WAXD that [beta]-iPP are primarily unoriented during the major growth process [49], What's more, in many cases, [beta] spherulites could be detected in neat iPP without crystalline or lamellar orientation under weak shear field [38, 53-57], Therefore, it can be concluded that oriented [alpha]-row nuclei are not necessary to induce [beta]-iPP.
The growth rates and morphology of the sample spherulites were determined by a polarized optical microscope (LV100 POL, Nikon) equipped with a hot stage.
Calcareous dung spherulites form on the intestinal tracks of animals and an association of their presence with intensive animal activity has been established at historic and archaeological sites (Courty et al.
The radial growth rate of spherulites is often used to measure crystallization rate.