Hydrated obsidian, generally light grey in color, that is commonly characterized by rounded, onion-skin-like fractures (perlitic cracks). Apache's tears are unhydrated clumps of fresh obsidian that are commonly found within regions containing perlite.

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

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  • Perlite — is an amorphous volcanic glass that has a relatively high water content, typically formed by the hydration of obsidian. It occurs naturally and has the unusual property of greatly expanding when heated sufficiently.Properties and usesWhen it… …   Wikipedia

  • perlite — [ pɛrlit ] n. f. • 1812; de perle 1 ♦ Minér. Silicate naturel, pauvre en eau, de la famille des feldspaths. 2 ♦ (v. 1960) Techn. Constituant microscopique des alliages ferreux. Fonte à perlite. ● perlite nom féminin (de perle) Rhyolite vitreuse… …   Encyclopédie Universelle

  • Perlite — Per lite, n. (Min.) Same as {Pearlite}. [1913 Webster] …   The Collaborative International Dictionary of English

  • perlite — [pʉr′līt΄] n. [Fr < perle,PEARL1] 1. Geol. a greenish volcanic glass, similar to obsidian, with a pearly luster and multiple, minute concentric cracks, used as insulation and in making concrete, plaster, etc. 2. PEARLITE perlitic [pər lit′ik]… …   English World dictionary

  • perlite — perlitic /perr lit ik/, adj. /perr luyt/, n. Petrog. a volcanic glass in which concentric fractures impart a distinctive structure resembling masses of small spheroids, used as a plant growth medium. Also, pearlite. [1825 35; < F; see PEARL1,… …   Universalium

  • Perlite — Perlit (vulkanisches Glas) mit weißem, pudrigen Aussehen Perlit (englisch: perlite) bezeichnet in den Geowissenschaften ein alteriertes (chemisch und physikalisch umgewandeltes) vulkanisches Glas (Obsidian) und zählt damit zu den Gesteinen. Die… …   Deutsch Wikipedia

  • Perlite — Cette page d’homonymie répertorie les différents sujets et articles partageant un même nom. La perlite est un constituant biphasé de l acier. La perlite est une roche naturelle à base de silice. Catégorie : Homonymie …   Wikipédia en Français

  • perlite — per·lì·te s.f. 1. TS petr. roccia effusiva acida costituita principalmente da vetro disposto in concrezioni simili a perle che si formano durante il raffreddamento, utilizzata come isolante termoacustico 2. TS metall. eutettico di ferrite e… …   Dizionario italiano

  • perlite —   n. volcanic glass forming, when expanded by heat, an insulating material and a light weight aggregate added to concrete and plaster or used as soil conditioner.    ♦ perlitic, a. having perlite like texture …   Dictionary of difficult words

  • perlite — perlitas statusas T sritis chemija apibrėžtis Kaitinant išpūsti, 5–20 kartų padidėję rūgščiosios vulkaninės uolienos grūdeliai atitikmenys: angl. pearlite; perlite rus. перлит …   Chemijos terminų aiškinamasis žodynas

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