spherulite


spherulite
GLOSSARY OF VOLCANIC TERMS
Typically rounded, radiating arrays of crystal fibers produced by the high temperature devitrification of volcanic glass. In felsic rocks, the crystal fibers are generally composed of alkali feldspar and a silica polymorph (either quartz or cristobalite), whereas in mafic rocks the fibers commonly consist of plagioclase and/or pyroxene. Spherulites typically have diameters of 0.1-2.0 cm, but can be much larger (commonly up to 20 cm). Isolated spherulites are generally spherical, but adjacent spherulites may impinge upon one another to produce long chains that are often aligned with flow foliation (McPhie et al., 1993, p. 24-25).

Glossary of volcanic terms. - University of Wisconsin Oshkosh. . 2001.

Look at other dictionaries:

  • Spherulite — Spher u*lite, n. [Cf. F. sph[ e]rulite.] (Min.) A minute spherical crystalline body having a radiated structure, observed in some vitreous volcanic rocks, as obsidian and pearlstone. [1913 Webster] …   The Collaborative International Dictionary of English

  • spherulite — [sfer′ə līt΄, sfer′yə līt΄, sfirə līt, sfiryə lāt΄] n. [ SPHERULE + ITE1] a rounded or spherical crystalline body found in some glassy volcanic rocks spherulitic [sfer′oolit′ik, sfer yoolit′ik, sfir′oolit′ik, sfir′yoolit′ik] adj …   English World dictionary

  • Spherulite — Spherulites, in petrology, are small, rounded bodies that commonly occur in vitreous igneous rocks. They are often visible in specimens of obsidian, pitchstone and rhyolite as globules about the size of millet seed or rice grain, with a duller… …   Wikipedia

  • spherulite — sferolitas statusas T sritis chemija apibrėžtis Rutulinis kristalitų darinys. atitikmenys: angl. spherulite rus. сферолит …   Chemijos terminų aiškinamasis žodynas

  • spherulite — noun Date: 1823 a usually spherical crystalline body of radiating crystal fibers often found in vitreous volcanic rocks • spherulitic adjective …   New Collegiate Dictionary

  • spherulite — spherulitic /sfer oo lit ik, yoo , sfear /, adj. /sfer oo luyt , yoo , sfear /, n. Petrol. a rounded aggregate of radiating crystals found in obsidian and other glassy igneous rocks. [1815 25; SPHERULE + ITE1] * * * …   Universalium

  • spherulite — noun a minute spherical crystalline body having a radiated structure, observed in some vitreous volcanic rocks, as obsidian and pearlstone. Syn: spherolithe …   Wiktionary

  • spherulite — spher·u·lite sfir yə .līt, sfer n a usu. spherical crystalline body of radiating crystal fibers spher·u·lit·ic .sfir yə lit ik, .sfer adj …   Medical dictionary

  • spherulite — [ sfɛrjʊlʌɪt] noun chiefly Geology a small spheroidal mass of crystals grouped radially around a point. Derivatives spherulitic adjective Origin C19: from spherule + ite1 …   English new terms dictionary

  • spherulite — spheru·lite …   English syllables


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