[ak-tin-l-ahyt, ak-tuh-nl-]
noun Mineralogy.
a variety of amphibole, occurring in greenish bladed crystals or in masses.

1825–35; actino- + -lite

actinolitic [ak-tin-l-it-ik, ak-tuh-nl-] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
actinolite (ækˈtɪnəˌlaɪt)
a green mineral of the amphibole group consisting of calcium magnesium iron silicate. Formula: Ca2(Mg,Fe)5Si8O22(OH)2
[C19: from actino- (from the radiating crystals in some forms) + -lite]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
actinolite   (āk-tĭn'ə-līt')  Pronunciation Key 
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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Anthophyllite can be distinguished from actinolite and tremolite by its nearly parallel extinction.
Retrograde alteration to actinolite, chlorite, and clays may be present.
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