variolite

GLOSSARY OF VOLCANIC TERMS
A spherulite-like radiating aggregate composed of feathery, needle-like crystals of plagioclase and pyroxene that occur in mafic volcanic rocks (typically basalt). Variolites may result from devitrification, but are commonly believed to be formed in subaqueous rocks by quench-induced crystallization (Cas and Wright, 1987, p. 420).

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

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  • variolite — ● variolite nom féminin (de variolé) Roche basaltique à sphérolites d albite, que l on trouve en galets dans la Durance et qui correspond à des fragments d écorce de pillow lavas. variolite [vaʀjɔlit] n. f. ÉTYM. Mil. XXe; de variole, et ite. ❖ ♦ …   Encyclopédie Universelle

  • Variolite — Va ri*o*lite, n. [L. varius various + lite: cf. F. variolite.] (Geol.) A kind of diorite or diabase containing imbedded whitish spherules, which give the rock a spotted appearance. [1913 Webster] …   The Collaborative International Dictionary of English

  • variolite — [ver′ē ə līt΄] n. 〚Ger variolit < ML variola (see VARIOLA): from its pitted surface〛 Geol. any igneous rock containing varioles * * * var·i·o·lite (vârʹē ə līt , vărʹ ) n. A basic rock whose pockmarked appearance is caused by the presence of num …   Universalium

  • variolite — [ver′ē ə līt΄] n. [Ger variolit < ML variola (see VARIOLA): from its pitted surface] Geol. any igneous rock containing varioles …   English World dictionary

  • Variolite — Variolites (Latin varius , speckled, variegated ) are a group of dark green basic igneous rocks that, especially on weathered surfaces, exhibit pale colored spots, or spherules, that give them a pockmarked appearance. In some conditions these… …   Wikipedia

  • Variolite — La variolite, du latin « variola » est une roche de texture compacte de couleur vert clair, dont le relief présente de petits boutons blanchâtres en forme de pustules qui lui a valu son nom, attribué par le géologue et minéralogiste… …   Wikipédia en Français

  • variolite — (va ri o li t ) s. f. Roche de cristallisation, constituée par une pâte de pétrosilex de diverses couleurs, renfermant des noyaux sphéroïdaux de pétrosilex, dont la couleur diffère de celle de la pâte, dite aussi pierre à picot, pierre de la… …   Dictionnaire de la Langue Française d'Émile Littré

  • variolite — var·i·o·lite …   English syllables

  • variolite — /ˈvɛəriəlaɪt/ (say vairreeuhluyt) noun any of certain fine grained, basic igneous rocks containing light coloured spherules, which, especially on weathered surfaces, give them a pockmarked appearance. {variol(a) + ite1} …   Australian English dictionary

  • variolite — n. a rock with embedded small spherical masses causing on its surface an appearance like smallpox pustules. Derivatives: variolitic adj. Etymology: as VARIOLE + ITE(1) …   Useful english dictionary

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