Actinolite Definition

ăk-tĭnə-līt
noun
A greenish variety of amphibole.
American Heritage
A dark-colored, often greenish amphibole, Ca2(Mg, Fe)5(Si8O22)(OH)2, commonly found in schists and marbles.
Webster's New World
A greenish amphibole mineral, Ca2 (Mg,Fe)5 Si8 O22 (OH)2 , that occurs in several forms, including a fibrous form that is a variety of asbestos.
American Heritage Medicine

(mineralogy) A mineral with monoclinic crystals of the chemical formula Ca2(Mg,Fe)5Si8O22(OH)2, belonging to the amphibole group.

Wiktionary
other
A greenish variety of amphibole. Actinolite is a monoclinic mineral, and occurs in long, slender, green needlelike crystals, or in fibrous, radiated forms in metamorphic rocks. Chemical formula: Ca2(Mg,Fe)5Si8O22OH2.
American Heritage Science
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Other Word Forms of Actinolite

Noun

Singular:
actinolite
Plural:
actinolites

Actinolite Sentence Examples

  • They are soft and lustrous, with a peculiarly smooth feel, and though often confounded with mica-schists may be distinguished by their richness in magnesia; many of them contain tremolite or actinolite; others have residual grains of olivine or augite; and here also every gradation can be found between the unmodified igneous types and the perfectly metamorphic schists.

  • From these rocks in the Ottawa valley are quarried or mined granite, marble, magnificent blue sodalite, felspar, talc, actinolite, mica, apatite, graphite and corundum; the latter mineral, which occurs on a larger scale here than elsewhere, is rapidly replacing emery as an abrasive.

  • Enclosures of other minerals (rutile, chlorite, haematite, gothite, actinolite, asbestos and many others) are extremely frequent in crystals of quartz.

  • The six types of asbestos are chrysotile, crocidolite, amosite, anthophyllite asbestos, tremolite asbestos, and actinolite asbestos.

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Words Starting With

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