actinolite

actinolitic /ak tin'l it"ik, ak'teuh nl-/, adj.
/ak tin"l uyt', ak"teuh nl-/, n. Mineral.
a variety of amphibole, occurring in greenish bladed crystals or in masses.
[1825-35; ACTINO- + -LITE]

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Colourless to green amphibole mineral, darkening with increased iron content from green to black.

It has a prismatic and splintery texture and is abundant in regionally metamorphosed (see metamorphism) rocks such as schists. Actinolite has a monoclinic crystal structure, and it may alter to chlorite. See also asbestos.

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      an amphibole mineral in the tremolite-actinolite series of calcium, magnesium, and iron silicates. The minerals in this series are abundant in regionally metamorphosed rocks, such as schists. Tremolite may weather to talc, and both tremolite and actinolite may alter to chlorite or carbonates. For chemical formula and detailed physical properties, see amphibole (table).

      The fibres of the magnesium-rich members in the series are asbestos; these varieties, sometimes known as amphibole asbestos, constitute the material to which the name asbestos was originally given. The fibres are fine and silky and possess appreciable tensile strength; those that occur in thin, felted sheets of interwoven fibres are called mountain leather; in thicker sheets, mountain cork; and in compact masses resembling dry wood, mountain wood.

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Universalium. 2010.

Synonyms:

Look at other dictionaries:

  • Actinolite — Ac*tin o*lite, n. [Gr. ?, ?, ray + lite.] (Min.) A bright green variety of amphibole occurring usually in fibrous or columnar masses. [1913 Webster] …   The Collaborative International Dictionary of English

  • actinolite — [ak tin′ə līt΄] n. a dark colored, often greenish amphibole, Ca2 (Mg, Fe) 5 (Si8O22)(OH) 2, commonly found in schists and marbles …   English World dictionary

  • Actinolite — For the community in Canada, see Actinolite, Ontario. Actinolite Actinolite crystal from Portugal General Category …   Wikipedia

  • actinolite — Amphibole Am phi*bole ([a^]m f[i^]*b[=o]l), n. [Gr. amfi bolos doubtful, equivocal, fr. amfiba llein to throw round, to doubt: cf. F. amphibole. Ha[ u]y so named the genus from the great variety of color and composition assumed by the mineral.]… …   The Collaborative International Dictionary of English

  • actinolite — aktinolitas statusas T sritis chemija apibrėžtis Mineralas. formulė Ca₂(Mg,Fe)₅[(OH,F)|Si₄O₁₁]₂ atitikmenys: angl. actinolite rus. актинолит …   Chemijos terminų aiškinamasis žodynas

  • actinolite — noun Date: 1796 a bright green or grayish green mineral of the amphibole group that is a silicate of calcium, magnesium, and iron occurring in fibrous, radiate, or columnar forms …   New Collegiate Dictionary

  • Actinolite — Actinote (minéral) Pour les articles homonymes, voir Actinote. Actinote Catégorie IX : silicates …   Wikipédia en Français

  • actinolite — noun A mineral with monoclinic crystals of the chemical formula Ca(Mg,Fe)SiO(OH), belonging to the amphibole group …   Wiktionary

  • actinolite — ac·ti·no·lì·te s.f. TS mineral. minerale del gruppo degli anfiboli monoclini, che si presenta in aggregati di cristalli fibrosi di colore variabile dal grigioverde al verde scuro {{line}} {{/line}} DATA: 1892. ETIMO: comp. di actino e 1 lite …   Dizionario italiano

  • actinolite — [ak tɪnəlʌɪt] noun a green mineral of the amphibole group occurring chiefly in metamorphic rocks and as a form of asbestos. Origin C18: from Gk aktis, aktin ray + lithos stone (because of the ray like crystals) …   English new terms dictionary

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