单词	spherulite
释义	spherulite /ˈsfɛrjʊlʌɪt / noun chiefly Geology A small spheroidal mass of crystals (especially of a mineral) grouped radially around a point.Although they lack the fibrous, radiating crystals that conform to the traditional definition of a spherulite, their cores show a crystal size and density somewhat higher than that of the surrounding rhyolite shell.... In the absence of salt, the spherulite kinetic assay suggests the presence of spherulites from ~ 40 to 45 min. Under the polarized light microscope, addition of a full waveplate to the optical set-up showed that spherulites grown in the absence or presence of salt contain radially oriented amyloid fibrils. Derivatives spherulitic /sfɛrjʊˈlɪtɪk/ adjective ... Their study of whole-rock chemistry has shown somewhat higher silica contents of the spherulitic structures as compared to the host rhyolite glass. They typically grow in two-dimensional fanlike and spherulitic arrays. Besides, the aragonitic shell is made up of two oriented layers: an irregular spherulitic prismatic layer and a fine complex crossed lamellar layer. Origin Early 19th century: from spherule + -ite1.
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