Opal O"pal, n. [L. opalus: cf. Gr. ?, Skr. upala a rock, stone, precious stone: cf. F. opale.] (Min.) A mineral consisting, like quartz, of silica, but inferior to quartz in hardness and specific gravity. [1913 Webster]

Note: The {precious opal} presents a peculiar play of colors of delicate tints, and is highly esteemed as a gem. One kind, with a varied play of color in a reddish ground, is called the {harlequin opal}. The {fire opal} has colors like the red and yellow of flame. {Common opal} has a milky appearance. {Menilite} is a brown impure variety, occurring in concretions at Menilmontant, near Paris. Other varieties are {cacholong}, {girasol}, {hyalite}, and {geyserite}. [1913 Webster]

The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • Geyserite — is a form of opaline silica that is often found around hot springs and geysers. Botryoidal geyserite is known as fiorite.References* [ Mindat with location data] …   Wikipedia

  • Geyserite — Gey ser*ite (g[imac] z[ e]r*[imac]t or g[imac] s[ e]r*[imac]t; 277), n. [From {Geyser}.] (Min.) A loose hydrated form of silica, a variety of opal, deposited in concretionary cauliflowerlike masses, around some hot springs and geysers. [1913… …   The Collaborative International Dictionary of English

  • geyserite — [gī′zər īt΄] n. siliceous material, usually opaline silica, deposited on the edges of geysers and hot springs …   English World dictionary

  • geyserite — noun Etymology: French geysérite, from geyser, from Icelandic Geysir Date: circa 1814 a variety of opal that is deposited around some hot springs and geysers in white or grayish concretions …   New Collegiate Dictionary

  • geyserite — geizeritas statusas T sritis chemija apibrėžtis Nuosėdinė uoliena iš opalo su aliuminio ir šarminių elementų junginių priemaiša. atitikmenys: angl. geyserite rus. гейзерит …   Chemijos terminų aiškinamasis žodynas

  • geyserite — rīt noun ( s) Etymology: French geysérite, from geyser (from Icelandic Geysir) + ite : a hydrous form of silica that constitutes one variety of opal and is deposited around some hot springs and geysers in white or grayish concretionary ma …   Useful english dictionary

  • geyserite — /guy zeuh ruyt , seuh /, n. Petrol. a variety of siliceous sinter deposited about the orifices of geysers and hot springs. [1805 15; GEYSER + ITE1] * * * …   Universalium

  • geyserite — noun A type of stone, a mixture of quartz and opal …   Wiktionary

  • geysérite — (entrée créée par le supplément) (ghey sé ri t ) s. f. Terme de minéralogie. Espèce d opale …   Dictionnaire de la Langue Française d'Émile Littré

  • geyserite — gey·se·rì·te s.f. TS mineral. minerale costituito da una varietà di opale, di colore grigio o bianco, che si presenta in incrostazioni intorno alle bocche dei geyser {{line}} {{/line}} DATA: 1875 …   Dizionario italiano

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