L'aphanite est une roche magmatique dont la structure est à grain très fin. Les cristaux qui la composent sont si petits qu'ils ne peuvent être observés à l'œil nu. L'aphanite était utilisée par les artisans du Néolithique pour fabriquer des haches et autres outils.
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Aphanite — Aph a*nite, n. [Gr. ? invisible; a priv. + ? to appear.] (Min.) A very compact, dark colored ?ock, consisting of hornblende, or pyroxene, and feldspar, but neither of them in perceptible grains. [1913 Webster] … The Collaborative International Dictionary of English
Aphanite — (from the Greek αφανης, invisible) is a name given to certain typically dark coloured igneous rocks which are so fine grained that their component mineral crystals are not detected by the unaided eye. This texture results from rapid cooling in… … Wikipedia
aphanite — [af′ə nīt΄] n. [Gr aphanēs, invisible < a , not + base of phainein, to appear (see FANTASY) + ITE1] rock so closely grained that its individual crystals cannot be seen by the unaided eye aphanitic [af′ənit′ik] adj … English World dictionary
aphanite — aphanitic /af euh nit ik/, adj. /af euh nuyt /, n. Petrog. a fine grained igneous rock having such compact texture that the constituent minerals cannot be detected with the naked eye. [1860 65; < Gk aphan(és) unseen, hidden, invisible (a A 6 +… … Universalium
aphanite — noun Certain dark igneous rocks having grain so fine that the individual crystals cannot be seen with the naked eye … Wiktionary
aphanite — (a fa ni t ) s. f. Terme de géologie. Sorte de roche. ÉTYMOLOGIE Terme grec signifiant non apparent, à cause que les parties fondues de cette roche ne se laissent pas reconnaître à l oeil … Dictionnaire de la Langue Française d'Émile Littré
aphanite — n. type of fine grained rock … English contemporary dictionary
aphanite — aph·a·nite … English syllables
aphanite — /ˈæfənaɪt/ (say afuhnuyt) noun any fine grained igneous rock having such compact texture that the constituent minerals cannot be detected with the naked eye. {Greek aphanēs obscure + ite1} –aphanitic /æfəˈnɪtɪk/ (say afuh nitik), adjective …
aphanite — noun fine grained homogeneous rock (such as basalt) containing minerals undetectable by the naked eye • Derivationally related forms: ↑aphanitic • Hypernyms: ↑rock, ↑stone … Useful english dictionary
