actinolite

noun
ac·​tin·​o·​lite | \ak-ˈti-nə-ˌlīt \

Definition of actinolite 

: 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

First Known Use of actinolite

1794, in the meaning defined above

History and Etymology for actinolite

actino- + -lite; translation of German Strahlstein, Strahlschörl (earlier New Latin actinotus in the terminology of the naturalist J. F. Gmelin)

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The first known use of actinolite was in 1794

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