spherulite

spher·u·lite

S0633900 (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]

Spherulite

enUK

spherulite

[′sfir·ə‚līt] (geology) A spherical body or coarsely crystalline aggregate having a radial internal structure arranged about one or more centers.

Spherulite

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.

单词	spherulite
释义	spherulite enUK spher·u·lite S0633900 (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] Spherulite enUK spherulite [′sfir·ə‚līt] (geology) A spherical body or coarsely crystalline aggregate having a radial internal structure arranged about one or more centers. Spherulite 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.
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